Which is the most highly sensitive time within the developing embryo for the risk of malformation related to environmental teratogens

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Answer 1

The most highly sensitive time within the developing embryo for the risk of malformation related to environmental teratogens is cleft palate at 8 weeks gestation. It is an opening in the roof of the mouth.

A teratogen is any substance and/or physical agent that may cause an irreversible abnormality in the structure of the developing embryo or fetus (e.g., classical pesticides such as DDT).

Cleft palate is a malformation mainly caused by mutagenic agents (teratogens) during pregnancy, which affects approximately one (1) of 650 births.

A cleft palate is a malformation that occurs when the two plates of the skull that form the roof of the mouth cannot be completely joined.

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I need the order please

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What are the options

persistent depressive disorder, or dysthymia, is characterized by

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Given what we know, we can confirm that persistent depressive disorder, or dysthymia, is characterized by the presence of prolonged depressive symptoms.

What is a depressive disorder?A depressive disorder is a condition that causes a lack of motivation, happiness, and other positive feelings.Depression is experienced by millions of people from around the world. It can be induced by events in one's life, or be caused by a chemical imbalance in the brain.

What separates it from depression?What separates a depressive disorder from a more common case of depression is the frequency by which the symptoms manifest. They are known as depressive disorders when the symptoms are chronic in nature, meaning they manifest repeatedly and for prolonged durations.

Therefore, we can confirm that persistent depressive disorder, or dysthymia, is characterized by persistent symptoms relating to depressive episodes, that are chronic in nature and often caused by chemical imbalances in the brain.

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An ocean pH change from 8.2 to 8.0 is NOT significant as the .2 change is very small.

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So far, the ocean's pH has dropped from about 8.2 in preindustrial times to around 8.05. This seemingly small change may already be affecting ocean organisms and future CO2 emissions could lower ocean pH even further

Why is an atom said to be electrically neutral? Please i need further explanation​

Answers

Atoms are electrically neutral because they contain equal quantities of positively charged protons and negatively charged electrons. Electrons and protons have equal but opposite charges, so the result is no net charge.

In osmosis, water moves from an area of high solute concentration to an area with lower solute concentration. True False

Answers

Answer:

FALSE

Explanation:

Osmosis is the process by which molecules of a solvent pass through a semipermeable membrane from a less concentrated solution into a more concentrated one.

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why do heart cells have a higher percentage of mitochondria than liver and pituitary gland cells?

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Answer:

This is because the heart requires large amounts of energy in order to pump blood to the rest of the body. The mitochondria produces ATP for energy, thus heart cells contain a higher percentage of mitochondria for energy to pump blood.

The heart cells have a higher percentage of mitochondria than liver and pituitary gland cells because the heart requires large amounts of energy in order to pump blood to the rest of the body. The mitochondria produces ATP for energy, thus heart cells contain a higher percentage of mitochondria for energy to pump blood.

What is the role of mitochondria in producing energy?

The role of Mitochondria in producing energy are in charge of producing energy as ATP. The heart muscle has the highest energetical requirements. Several mitochondria compose these muscle cells because too much energy is needed to pump blood constantly.

Mitochondria are known as the one of the biggest organelles in the cell. They are semi-autonomous organelles surrounded by a double membrane that reproduce by binary fission and contain their own DNA, RNA, and ribosomes. Mitochondria are in charge of aerobic cell respiration, the process by which cells use organic compounds and turn them into energy.

Therefore, The mitochondria produces ATP for energy, thus heart cells contain a higher percentage of mitochondria for energy to pump blood.

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what is the name of the process in bacteria that involves dna transfer through a cytoplasmic connection known as a pilus?

Answers

It is called conjugation.

earthquakes occur at weak palces in the crust knows as

Answers

Answer:

Divergent plate Boundaries

Yea, the person above me is 100% correct lol, they are called divergent plate boundaries

Evolution represents biological change that accumulates over time. However, this change is not always apparent at every level in the biological hierarchy. Scientists most commonly observe the effects of evolution at the ________ level.

Answers

Answer:

population level

Explanation:

it ocurrs at the population level as scientists requires genetic variation between individuals of a population for natural selection

why is bromophenol blue added to the individual dna samples?

Answers

Answer:

It allows the observer to view how far the DNA samples travel.

Explanation:

It was an answer on a test I just got back.

if the woman and a man with normal clotting function have one biological daughter and one biological son, which children are predicted to have hemphilia A

Answers

The children Thats predicted to have hemophilia is the biological son

is it safe to use it

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is it safe to use what

please help, thank you!

Answers

Answer:

regulates which materials enter and leave the cell

Why do scientisits use light rays to represent light rays

Answers

Light rays allow us to draw clear diagrams showing the motion of light, including reflection (like bouncing off mirrors) and refraction (the bending of light when moving from one transparent material to another). This is called ray tracing. ... Trying to show interference and diffraction is a limitation of using rays.

how long does it take new species to form on earth?

Answers

Research found that a major change to persist and for changes to accumulate took about one million years

Million of years...

tehy where evolving for a couple million years until we have the animals we have now

Construct a table to give ONE source, the functions and the effects of the deficiency of the following micronutrients, Vitamin C, Vitamin D, Iron and iodine.​

Answers

Answer:

I say Vitamin D.

Explanation:Confirmed with the test results.

in gel electrophoresis, a loading dye is usually added to the sample of dna to be loaded in the wells of the gel. why would this be important?

Answers

Answer:

Gel loading dye is typically made at 6X concentration (0.25% bromphenol blue, 0.25% xylene cyanol, 30% glycerol). Loading dye helps to track how far your DNA sample has traveled, and also allows the sample to sink into the gel. ... It is important to use the same running buffer as the one used to prepare the gel.

What is is called when a doctor removes both an ovarian cyst and the affected ovary?

Answers

Answer:

b. Oophorectomy

Explanation:is correct. post protected

A population of 200 mice contains 168 brown mice. Brown is dominant to gray. How much of the population would be h e t e r o z y g o u s?
A. 32%
B. 84%
C. 48%
D. 16%

Answers

The answer is B, yo welcome

The heterozygous population in the population of 200 mice is 84%. The correct option is B.

What is heterozygous?

Heterozygous means having two types of alleles for the same type of gene. These alleles show two types of characters for a single gene. An example is a person having an allele of brown and black hair.

The population is 200 of which 168 mice are brown

By the Hardy–Weinberg (HW) equilibrium

q² (bb) = (200 - 168) /200 = 32 / 200 = 0.16

q: √ 0.16 = 0.4

p = 1 - q = 1 - 0.4 =  0.6

p² (BB) = 0.6 x 0.6 = 0.36

Thus, the correct option is B. 84% regarding the heterozygous population.

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Headlands are formed through wave deposition

True or False

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Answer: True

Explanation: The movement of water and sediment down a beach caused by waves coming in to shore at an angle. A beach formed by longshore drift that projects like a finger out into the water. A sea arch is formed through wave erosion. Headlands are formed by through wave deposition.

which region of the brain contains gyri and sulci?

Answers

Answer:

The cerebral cortex, or the outer layer of the cerebrum

Explanation:

Underground stem of which of the following does not store food? a)Zaminkand
b)Colocasia
c)Turmeric
d)Asparagus​

Answers

Answer:

asparagus doesn't store food.

Students observed the shape of the Moon with the same amount of time between each observation. They drew this sequence.



Complete each of the 2 activities for this Task.
Activity 1 of 2
How long did it take them to record this sequence?



(Mark the one best answer.)



A.
About 2 days

B.
About 2 weeks

C.
About 2 months

D.
About 2 years

Answers

Answer:

B about 2 weeks

Explanation:

Two weeks is how long it would take to observe five moon phases. Rather that 2 months which would show two full moon cycles.

Help me asappp!!!

Which two activities are practical applications of magnetism?
A. Separating steel nails from aluminum nails
B. Using the North Star to find which way is south
C. Hammering steel nails into wooden boards
D. Finding which way is north with a compass

Answers

Answer:

It is d and a

Explanation:

Where on the planet would you receive more direct sunlight?

A) locations in the mid-latitudes

B) at the North Pole

C) at the South Pole

D) places near the Equator

Answers

Answer:

D. places near the equator

D. places by the equator

the sun rotates in the equator and it’s always the hottest near the equator so yeah.

Which RNA is directly responsible for catalyzing the peptide bond between amino acids during translation

Answers

Ribosomal RNA (rRNA) is directly responsible for catalyzing the peptide bond between amino acids during translation.

The products of photosynthesis are the

Answers

Answer:

Oxygen (byproduct) and Glucose (sugar for cell use)

Explanation:

A  cycle between cellular respiration and photosynthesis exists in plants.

Photosynthesis -> Oxygen and Glucose - > Cellular respiration - > Carbon Dioxide and ATP (energy for cellular use)

Then, the cycle continues.

freshwater fish excrete nitrogenous wastes as _____.

Answers

It released such as poop and children

Adolescent may conform with peers out of fear of

A. Becoming depressed.

B. being arrested.

C. establishing a new identity.

D. being disliked

E. Other

Answers

B. I think correct answer
I think it could be B

in which phase of the cell cycle do cells check to determine whether the dna is fully and correctly replicated?

Answers

Answer:

at the end of G2

Explanation:

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