Question on my study about Charles Darwin and his theory of evolution...
Compare the fossils of horse ancestors wither the structures of a modern horse. According to the fossil record, which species in the horses' ancestry was likely the first to run on three toes?
a. merychippus
b. hyracotherium
c. mesohippus
d. pliohippus
Answers
Hyracotherium, also known as Eohippus, is considered the earliest known ancestor of the modern horse. Fossil evidence indicates that it was a small animal, standing only about 12 to 14 inches tall at the shoulder, and it had four toes on its front feet and three toes on its hind feet.
Over time, the horse evolved to become larger and faster, and its toes also underwent changes. Fossils of later horse ancestors such as Mesohippus, Merychippus, and Pliohippus show a gradual reduction in the number of toes until only a single toe remains. The modern horse has a single toe on each foot, which is supported by a single large bone, the equivalent of the middle toe in the human foot.
Therefore, according to the fossil record, Hyracotherium or Eohippus was the species in the horses' ancestry that was likely the first to run on three toes.
Related Questions
5. The atmosphere of early Earth is unlike today's atmosphere.
A. When did oxygen first appear in Earth's early atmosphere? (3 points)
B. What factor caused the appearance of oxygen? (3 points)
C. What is one form of evidence used to support this theory? (4 points)
Answers
Answer:
A. Oxygen first appeared in Earth's early atmosphere about 2.4 billion years ago.
B. The appearance of oxygen was caused by the emergence of photosynthetic organisms, such as cyanobacteria, which began to produce oxygen as a byproduct of photosynthesis.
C. One form of evidence used to support this theory is the presence of banded iron formations in sedimentary rocks. These formations contain layers of iron oxide that were likely deposited as a result of the reaction of iron dissolved in seawater with the oxygen produced by photosynthetic organisms. The presence of these formations suggests that oxygen was not present in Earth's atmosphere before the emergence of photosynthetic organisms.
Explanation:
Describe four key elements of the physical environment that determine which species can
live in a particular area.
Answers
By describing the temperature range, kind of soil, quantity of light, and amount of water that are unique to that area, scientists may pinpoint a biome. These elements help certain species fill specific niches.
What are some illustrations of the physical environment?The physical environment, in which we live and have an impact on one's health, is defined as the exterior surrounds and situations. All the varied elements of nature, such as the air, trees, greenery, lakes, and ocean, are included in the physical environment. The physical environment consists of the land, the air, the water, the plants and animals, the buildings and other infrastructure, as well as all of the natural resources that meet our fundamental requirements and offer potential for social and economic development. For people's physical and mental welfare, a clean, healthy environment is crucial. Environmental elements include air, water, climate, soil, indigenous plants, and landforms. By definition, environmental factors affect daily living and play a substantial role in the health inequalities that occur between various geographical areas.To learn more about physical environment, refer to:
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Explain the existence of oxygen gas on the early earth.
Answers
Most scientists concur that oxygen was likely fermenting in the oceans as a result of cyanobacterial photosynthesis so early as 3 billion years ago, even if it was missing in the atmosphere at the time.
Was there oxygen gas on the early Earth?The early Earth was insulated and kept warm at a crucial stage of its development by the greenhouse gases, water vapour, carbon dioxide, and methane. The early atmosphere, however, only included a very little amount of oxygen.
Why is it significant that oxygen gas is becoming more prevalent on early Earth?As a result, the oxygen given off by cyanobacteria changed the make-up of a earth's atmosphere, brought about the development of aerobic metabolism, it ultimately facilitated the advent of multicellularity. Oxygen is the primary component on today's Earth, which is much kinder and more beautiful than the early Earth.
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Carnivorous adaptations of plants mainly compensate for soil that has a relatively low content of A. potassium B. nitrogen C. calcium D. water E. phosphate
explanations of why the answers are
correct/incorrect please
Answers
Explanation:
The correct answer is B. Nitrogen. Plants require nitrogen for growth and development, and carnivorous plants have adapted to obtain nitrogen from the insects they consume. These adaptations allow them to survive in soils with low nitrogen content. A. Potassium is an essential nutrient for plants, but carnivorous plants do not obtain potassium from their prey; instead, they absorb potassium from the soil. C. Calcium is an essential nutrient for plants, but carnivorous plants do not obtain calcium from their prey; instead, they absorb calcium from the soil. D. Water is an essential nutrient for plants, but carnivorous plants do not obtain water from their prey; instead, they absorb water from the soil. E. Phosphate is an essential nutrient for plants, but carnivorous plants do not obtain phosphate from their prey; instead, they absorb phosphate from the soil.
1028 ABCD [Source: Examine The low-pressure cell in the sketch is a ... mid-latitude cyclone. tropical depression. coastal low. thermal low. periences
Answers
The low-pressure cell in the sketch is a mid-latitude cyclone.
What is a mid-latitude cyclone?Mid-latitude cyclones, also known as extratropical cyclones or wave cyclones, are large-scale low-pressure systems that form in the middle latitudes of the Earth's atmosphere, typically between 30 and 60 degrees latitude. They are characterized by a counterclockwise circulation in the Northern Hemisphere and a clockwise circulation in the Southern Hemisphere and are often associated with weather fronts, precipitation, and high winds.
The sketch likely shows a mid-latitude cyclone because it includes the characteristic features of such a system, including a low-pressure center, converging winds, and a cold front trailing to the south or east and a warm front trailing to the north or west.
Tropical depressions, coastal lows, and thermal lows are other types of low-pressure systems, but they typically have different characteristics and are found in different regions of the Earth's atmosphere.
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what is the pH of a solution that contains 1 x 10^-3M H3O+?
Answers
The pH οf the sοlutiοn is 3. pH is an impοrtant prοperty οf sοlutiοns in many scientific and technical fields, including chemistry, biοlοgy, envirοnmental science, and engineering.
What is pH?pH is a measure οf the acidity οr basicity οf a sοlutiοn, defined as the negative lοgarithm (base 10) οf the cοncentratiοn οf hydrοgen iοns (H+) in mοles per liter (M) οf the sοlutiοn. The pH scale ranges frοm 0 tο 14, with a pH οf 7 being neutral, pH values less than 7 indicating acidity, and pH values greater than 7 indicating basicity. A change οf οne pH unit represents a tenfοld change in the cοncentratiοn οf hydrοgen iοns.
The pH οf a sοlutiοn can have impοrtant effects οn chemical and biοlοgical prοcesses. Fοr example, enzymes and οther biοlοgical mοlecules are sensitive tο changes in pH, and can οnly functiοn within a narrοw range οf pH values.
The pH οf a sοlutiοn that cοntains 1 x 10⁻³ M H3O+ can be fοund using the fοllοwing fοrmula:
pH = -lοg[H3O+]
where [H3O+] is the cοncentratiοn οf the hydrοnium iοn in mοles per liter (M).
Substituting the given value οf [H3O+] = 1 x 10⁻³ M intο the equatiοn, we get:
pH = [-lοg(1 x 10⁻³) = 3
Therefοre, the pH οf the sοlutiοn is 3.
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2. In horses, black is dependent upon a dominant gene, B, and chestnut upon its recessive allele, b. The trotting gait is due to a dominant gene, T, the pacing gait to its recessive allele, t. If a homozygous black pacer is mated to a homozygous chestnut trotter, what will be the appearance of the F 1 generation?
Answers
The homozygous black pacer and homozygous chestnut trotter cross will result in heterozygous black pacers having the genotype BbTt in the F1 generation.
Are horses more likely to be black and trot?Black colour in horses is determined by a dominant gene (B), while chestnut colour is recessive (b). The pacing gait (t) is recessive, but the trotting gait (T) is caused by a dominant gene.
What does the horse gait gene entail?Whether a horse inherits one, two, or no mutant copies of DMRT3, the so-called "gait-keeper" gene, affects the animal's gaits. Horses without the mutation often exhibit the standard walk, trot, and canter gaits.
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HELP WILL GIVE BRAINLIEST
Question 1. What inferences and conclusions can you draw after observing the global patterns of earthquakes and volcanic activity?
Question 2. How might people and societies be affected by being located in earthquake-prone regions?
Answers
Answer:
question 1: earthquakes and volcanoes are arranged along tectonic plate boundaries.
question 2:Loss of life, Social Impact, Burden due to Injuries, Psychological Trauma, Economic damage, Environmental Damage.
Using the Kw of water, what is the OH- concentration of a solution that has a H3O+ concentration of 1x10^-9M?
A. is this solution natural , acidic , or basic?
B. what is the pH of this solution?
Answers
Pure water slightly separates into ions with roughly equivalent amounts of protons and hydroxide (OH) ions. [H+] is 107 for a solution, or acidity = 7.
What's the pH of an OH 10 10 M solution?A solution having a concentration of ionic species (OH-) of 1010 M has a pH of 4. This is due to the fact that the guth for this kind of solutions is 10, indicating the difference between the sum of the concentration of OH- ions in it. The sum of the pOH plus pH is 14. Hence, the pH =14–10 produces a pH of 4.
What percentage of H+ & OH ions are present in water?This indicates that in plain water, H + and OH - possess atomic concentrations of about 10–7 for each. A acidity of 7.0 results from a H + ratio od 10 - 7 M. H + and Hcl - are al
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5. Every human action affects the environment.
A. What are four impacts caused by the current growth rate of humans? (8 points)
B. How do each of these impacts affect the environment? (12 points)
Answers
Answer:
A. The current growth rate of humans has several impacts on the environment, including:
Deforestation: the clearing of forests for agriculture, urbanization, and logging.
Climate change: the alteration of the Earth's climate patterns due to human activities such as burning fossil fuels and deforestation.
Pollution: the release of toxic chemicals and other pollutants into the air, water, and soil by human activities such as industrial production, transportation, and waste disposal.
Loss of biodiversity: the disappearance of plant and animal species due to habitat destruction, pollution, and climate change.
B. Each of these impacts affects the environment in the following ways:
Deforestation leads to loss of habitat for wildlife, soil erosion, decreased water quality, and increased greenhouse gas emissions.
Climate change causes rising sea levels, increased frequency and intensity of extreme weather events such as hurricanes and droughts, and changes in temperature and precipitation patterns that affect ecosystems and agricultural production.
Pollution can harm human health, contaminate food and water supplies, and disrupt ecosystems by poisoning wildlife and reducing the quality of soil and water resources.
Loss of biodiversity reduces the resilience of ecosystems to environmental stressors, limits the availability of natural resources, and decreases the ability of ecosystems to provide services such as pollination, water purification, and climate regulation.
Explanation:
Answer:
A. Air pollution, burning fossil fuels, deforestation, water pollution.
B. Air pollution affects the environment, because air pollution damages crops and trees, when the plant absorbs the carbon dioxide, it absorbs what's in the air also, which has a big impact on the environment. Burning fossil fuels are an impact to the environment because when fossil fuels are burned, it creates large amounts of carbon dioxide that goes into the air, which traps heat into the atmosphere causing global warming. Deforestation is an impact on the environment because so many animals are losing their homes and that can cause endangered species, or possibly even extinction of a species. Water pollution effects the environment because all organisms that are living need water. When the water is polluted, animals, plants, etc, are affected.
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what is the relationship between pH and [H3O+] and [OH-]?
Answers
pH and the concentrations of [H3O+] and [OH-] are related in a way that if we know the value of one, we can calculate the other two using the equations mentioned above.
What is pH?
pH is a measure of the acidity or basicity of a solution, and it is defined as the negative logarithm (base 10) of the concentration of hydrogen ions, [H+], in a solution. The pH scale ranges from 0 to 14, where a pH of 7 is neutral, a pH less than 7 indicates acidity, and a pH greater than 7 indicates basicity (also called alkalinity).
pH = -log[H3O+]
The concentration of hydroxide ions, [OH-], in the solution can be related to the concentration of hydrogen ions through the equation:
Kw = [H3O+][OH-]
where Kw is the ion product constant for water, which has a value of 1.0 × 10^-14 at 25°C. At a given temperature, the product of the hydrogen ion concentration and hydroxide ion concentration is always equal to Kw. Therefore, if we know the concentration of either [H3O+] or [OH-], we can use this equation to calculate the concentration of the other ion.
In an acidic solution, the concentration of hydrogen ions is greater than the concentration of hydroxide ions, so [H3O+] > [OH-]. In a basic solution, the concentration of hydroxide ions is greater than the concentration of hydrogen ions, so [OH-] > [H3O+]. In a neutral solution, the concentration of hydrogen ions is equal to the concentration of hydroxide ions, so [H3O+] = [OH-], and the pH is 7.0.
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Prokaryotes can only be unicellular or single-celled. Eukaryotes can be unicellular or single-celled as well. Can eukaryotes be multicellular? How do you know this?
Answers
Yes, eukaryotes can be multicellular. Multicellularity is actually one of the defining features of eukaryotic organisms.
Explanation:
Eukaryotes are organisms that have a nucleus and other membrane-bound organelles, which allow for greater complexity and specialization within cells. This complexity also allows for the development of multicellularity. Multicellular organisms are composed of many cells that work together to form specialized tissues and organs, allowing for more efficient and effective functioning of the organism as a whole.
Examples of multicellular eukaryotes include animals, plants, fungi, and some protists. These organisms have evolved specialized mechanisms for communication and coordination among cells, such as intercellular signaling pathways and extracellular matrices, which allow them to function as complex, integrated organisms.
Define each defense mechanism in your own word and write an example.
1. repression
2.regression
3. reaction formation
4. projection
5. rationalization
6. displacement
7. denial
Answers
Example: A person who experienced a traumatic event in their childhood may repress the memory of it and have difficulty recalling the details later in life.
Regression: Reverting to an earlier stage of development or behaving in a childlike manner in order to cope with stress or anxiety.
Example: A college student who is stressed about upcoming exams may start sucking their thumb or carrying around a stuffed animal.
Reaction formation: Expressing the opposite of one's true feelings in order to conceal or manage unacceptable impulses.
Example: A person who has repressed their feelings of anger towards their boss may go out of their way to be excessively friendly and accommodating to them.
Projection: Attributing one's own unacceptable thoughts, feelings, or impulses onto someone else.
Example: A person who is in denial about their own jealousy towards their partner may accuse their partner of being jealous or possessive.
Rationalization: Justifying or excusing one's behavior or feelings in a way that avoids acknowledging underlying fears or conflicts.
Example: A person who is trying to quit smoking may rationalize their decision to have "just one more cigarette" by telling themselves that they will quit tomorrow.
Displacement: Redirecting one's unacceptable feelings or impulses onto a less threatening target.
Example: A person who is angry at their boss but cannot express it may come home and yell at their spouse over something minor.
Denial: Refusing to acknowledge or accept an uncomfortable reality, thought, or feeling.
Example: A person who has a drinking problem may deny that they have a problem, despite clear evidence of the negative impact it is having on their life
Which scenario is most likely to cause different changes in allele frequencies in two populations of the same species?
Responses
Drought affects both populations of the species.
Drought affects both populations of the species.
Females in both populations prefer the same traits in males.
Females in both populations prefer the same traits in males.
New predators are introduced to both of the populations.
New predators are introduced to both of the populations.
Predators are present in one population but not in the other.
Answers
Alleles with higher fitness can become more prevalent in the population, leading to microevolution (change in allele frequencies) caused by natural selection.
What accounts for the high allele similarity between two populations of the same species?Several of the same alleles can be found in two populations of the same species, even if the alleles didn't emerge until after the populations had split. Across populations, there is gene flow.
What is the name of the condition where the frequencies of two or more alleles of a gene stay largely stable across time?A population will experience generations of stability in the frequencies of alleles, or gene versions, and genotypes, or collections of alleles, if it is in a state known as Hardy-Weinberg equilibrium.
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Answer:Predators are present in one population but not in the other.
Explanation:
k12 quiz Genetic isolation
What is the hypothesis? Find the hypothesis in the Research Background
Answers
Your predictions about the results of your investigation are expressed in a hypothesis. It is a speculative solution to your research topic that hasn't been put to the test.
What kind of an assumption is this?Hypothesis Daily exposure to the sun increases levels of satisfaction. In this case, the independent variable and attributed cause is sun exposure. Happiness level is the regression coefficient and the assumed effect.
Is that a hypothesis or a question?Simply expressed, a hypothesis is a descriptive method that also identifies the expected or predicted result of the study. Without a working hypothesis, no scientific experiment or investigation can be carried out.
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The moon snail is...
a. a carnivore that uses propodium to plow forward
b. know to live on mud and sand flats
c. a species of abalone
d. a species of cowry
e. choice a & b are correct
f. choice b & c are correct
g. choice a & c are correct
h. choice a & d are correct
Answers
The correct answer is e. The moon snail is a kind of carnivorous sea snail that digs through mud and sand in pursuit of prey using a muscular protrusion called a propodium.
The moon snail is a kind of carnivorous sea snail that digs through mud and sand in pursuit of prey using a muscular protrusion called a propodium. They can frequently be seen in coastal locations on mud and sand flats. As a result, choices a and b are both accurate. The moon snail is not a species of cowry or an abalone, so choices c and d are incorrect. The correct answer is e.
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For the animal picture in the boxes below, type at least 3 adaptations they have and explain how these adaptations help them survive in their environments
Answers
Turtles have a strong, protective shell that aids in protecting them from predators and other threats. This is one of their adaptations.
What do animals do to adapt to their surroundings?An animal's ability to survive in its environment is enhanced by a physical or behavioral trait known as an adaptation. An adaptation is something a person does or has that makes it simpler for them to get food, water, mates, and shelter, to put it another way.
What five adaptations do animals have?Examples of structural adaptations that allow various creatures to live include the form of a beak, the type of feet, the placement of eyes, the existence of whiskers, the shape of a snout or ears, and the sharpness of teeth.
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what is a nonscientific question?
Answers
Answer:
A nonscientific question is a question that cannot be answered through the scientific method. Scientific questions are testable and based on empirical evidence, meaning they can be answered through observation and experimentation. In contrast, nonscientific questions may be subjective, speculative, or based on beliefs, opinions, or personal experiences that cannot be tested or verified through scientific methods.
Examples of nonscientific questions include:
What is the meaning of life?
Is there a higher power that controls the universe?
What is the best flavor of ice cream?
What is the most beautiful color?
Do ghosts exist?
Are humans inherently good or evil?
While these questions may be interesting or important to some people, they are not scientific questions because they cannot be answered through observation, experimentation, or objective data analysis.
6. The Paleozoic era started 550 million years ago. A. What event marks the beginning of the Paleozoic era? (3 points)
B. What event marks the end of the Paleozoic era? (3 points)
c. What evidence do we have to support these theories? (3 points)
Answers
Answer:
A. The beginning of the Paleozoic era is marked by the Cambrian explosion, which is a rapid diversification of life forms in the oceans.
B. The end of the Paleozoic era is marked by the Permian-Triassic extinction event, which is the largest mass extinction event in Earth's history, resulting in the loss of about 90% of marine species and 70% of terrestrial species.
C. There is fossil evidence that supports both the Cambrian explosion and the Permian-Triassic extinction event. The Cambrian explosion is supported by the sudden appearance of a diverse array of complex animal fossils in the rock record. The Permian-Triassic extinction event is supported by the disappearance of many fossil species in the rock record and the appearance of new species after the extinction event. Additionally, there is geological evidence of climate change, ocean acidification, and volcanic activity associated with the Permian-Triassic extinction event.
Explanation:
Which Earth-changing process
involves the gradual wearing away
of rock by wind, water, or ice
A Cooling
B Rotation
C Sedimentation
D Weathering
Answers
What do you call the equipment or technology used through to identify the age of this fossil fuels
Answers
Answer:There are three types of fossil fuels which can all be used for energy provision; coal, oil and natural gas. Coal is a solid fossil fuel formed over millions of years by decay of land vegetation. When layers are compacted and heated over time, deposits are turned into coal.
Explanation:
In a certain population ,the dominant phenotype of a certain trait occurs 90%?What is the frequency of the dominant allele?
Answers
Given that the dominant phenotype occurs in 90% of the population, we can say that p^2 + 2pq = 0.9 or 9/10.
We can then solve for p:
p^2 + 2pq = 0.9
p^2 + 2p(1-p) = 0.9
p^2 - 2p^2 + 2p = 0.9
-p^2 + 2p = -0.1
p^2 - 2p + 1 = 1.1
(p-1)^2 = 1.1
p-1 = ±sqrt(1.1)
p = 1 ± sqrt(1.1)
Since p is the frequency of the dominant allele, it cannot be greater than 1. Therefore, we take the negative root:
p = 1 - sqrt(1.1)
p = 0.05
So the frequency of the dominant allele is 0.05 or 5%.
what part of the brain determines if you remember
Answers
The hippocampus and other similar structures in the temporal lobe are thought to perform memory-related tasks, according to the majority of existing research. (The limbic system, a neural network, includes the neighboring hippocampus and amygdala as well.)
What is meant by hippocampus?The intricate brain region known as the hippocampus is buried deep within the temporal lobe. It is crucial for memory and learning. It is a flexible and weak structure that is susceptible to several stimuli damaging it. The hippocampus controls learning, memory encoding, memory consolidation, and spatial navigation as a crucial component of the limbic system. Amnesia, a disorder that hinders someone from creating new memories and recalling the past, can be brought on by damage to the hippocampus. Recent studies have demonstrated that the hippocampus is also involved in controlling mood, and that modifying activity in the ventral portion of the hippocampus can lessen anxiety.To learn more about hippocampus, refer to:
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______________ is large-scale evolution of new species over time.
Answers
Answer:
Explanation:
macroevolution
3. Observe the patterns in the nutrient data in relation to the chlorophyll data. What patterns do you observe?
Answers
Will rise to a peak and begin to fall back to the starting amount at the conclusion. any member of the most significant family of pigments involved in photosynthesis, chlorophyll.
What is chlorophyll and its function?The green substance used by plants during the process of photosynthesis is known as chlorophyll. However, if you try to buy it as a dietary supplement, you'll likely see it labelled as chlorophyllin, which is a copper, sodium, and water-soluble version of chlorophyll.
Chlorophyll is the green pigment found in the chloroplasts that are the site for the photosynthesis procedure. Chlorophyll's job is to transform carbon dioxide and water into glucose and oxygen by absorbing the sun's light energy. Glucose is used by plants to produce various plant parts.
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The complete question is,
photosynthesis Lab Questions Edit View Insert Format Tools Add-ons Help Last edit was 2 days ago A 100% - Normal text Arial 9 123456 3. Observe the patterns in the nutrient data in relation to the chlorophyll data What patterns do you observe? will increase to the peak and then start decreasing back to the number it started from in the end.
Researchers were able to observe changes in bacterial populations that resulted from mutations. How were the later generations of bacteria different from the original population?
1.) They were 25 percent faster due to having more tails.
2.)They lost the ability to reproduce.
3.) They were 25 percent faster due to having fewer tails.
4.) They required less food to grow and reproduce.
Answers
The correct answer is 3.) They were 25 percent faster due to having fewer tails. As a result of these mutations, the later generations of bacteria had fewer tails, which made them faster than the original population.
What do you mean by the expansion of the bacterial population?Rather than their cell size increasing, bacteria develop by multiplying, which is known as bacterial growth. These bacterial cells multiply exponentially; one cell multiplies into two, then four, then eight, then sixteen, and so on.
What four stages of bacterial growth are there?The four stages of bacterial growth are the lag phase, log phase, stationary phase, and death phase.
What do generation time and doubling time mean?The generation time, also known as the doubling time, is the amount of time needed for a cell to divide into two, or for the number of cells to double. The growth rate increases with the generation time.
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sort the chemical reactions based on whether they absorb or release energy
I'm asking this next to the other people who did because the answer with the most likes is wrong.
Answers
While viewing a slide of one-celled bacteria that moved very fast all day and all night, a studen concludes that these cells require a large amount of energy to maintain their activity. What organelles provide this needed energy?
Answers
It is likely that the fast-moving bacteria seen on the slide are using their mitochondria to generate the energy needed for their constant activity.
What is ATP?
ATP stands for Adenosine Triphosphate, which is a molecule that stores and provides energy for many cellular processes in living organisms. It is considered the "energy currency" of the cell.
ATP is made up of three components: adenine, a nitrogen-containing base; ribose, a five-carbon sugar; and three phosphate groups. The energy stored in ATP is found in the bonds between the phosphate groups. When a phosphate group is removed from ATP through a process called hydrolysis, energy is released that can be used by the cell for various functions.
The organelles that provide energy to cells are called mitochondria. They are responsible for producing ATP, the main energy currency of cells, through a process called cellular respiration.
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intelligence test scores refered to as intelligent quotient or IQ scores are based on characteristics such as verbal skills,abstruct reasoning power, numerical ability and spatial visualization.if plotted on a graph the distribution of IQ scores approximates a normal curve with a mean of about 100. an IQ scores above 115 is considered superior studies of "intellectually gifted" children have generally defined the lower limit of their IQ scores at 140: approximately 1% of the population have IQ scores above this limit.find the standard deviation of this distribution?
please help me!
Answers
The standard deviation of the distribution is given as 17.15
How to find the standard deviationAssuming that the distribution of IQ scores approximates a normal curve with a mean of 100, we can use the information given to find the standard deviation (σ) of the distribution.
First, we know that the IQ scores above 115 are considered superior, which means that the area under the normal curve to the right of 115 is approximately 0.15 (since approximately 15% of the population have IQ scores above 115).
Next, we know that approximately 1% of the population have IQ scores above 140. Since the distribution is assumed to be normal, we can use the properties of the normal distribution to find the z-score corresponding to the 99th percentile (since 99% of the population have IQ scores below 140).
Using a standard normal table or calculator, we find that the z-score corresponding to the 99th percentile is approximately 2.33.
We can then use the formula for z-score:
z = (x - μ) / σ
where z is the z-score, x is the IQ score, μ is the mean IQ score, and σ is the standard deviation of the IQ scores.
Plugging in the values we know, we get:
2.33 = (140 - 100) / σ
Solving for σ, we get:
σ = (140 - 100) / 2.33
σ ≈ 17.15
Therefore, the standard deviation of the IQ scores is approximately 17.15.
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Why do eukaryotic cells have many DNA molecules while prokaryotic cells have only one?
a. Eukaryotic cells need more organelles to carry out certain functions
or
b. Eukaryotic cells need more input to influence the growth and appearance of plants animals and other creatures.
Answers
Answer:
a
Explanation:
eukaryotic has cell membrane