a b c d ??? please help me

Answer:

Its the first one: acts as the control center of the cell

Explanation:

Answer:

A.

Explanation:

It acts as the brain of the cell as it tells other organelles their functions.

In your own words, define or describe what you
already know about photosynthesis?

Which of these Earth spheres interacts with coral reefs to cause coral bleaching?

Atmosphere
Cryosphere
Geosphere
Hydrosphere

which statement accurately describes bioaccumulation:
1) a substance, such as a pesticide, collects in the body of an organism over time.
2) the concentration of a substance increases as it moves up the food chain
3) a method to get rid of an invasive species in an ecosystem
4) pesticides in the soil, air and water become sources of pollution.

which of the following blood types is considered a "universal reciever" A B AB O
​

Which term means having only one set of chromosomes?
A. Angiosperm
B. Gymnosperm
C. Diploid
D. Haploid

Which of the following most accurately describes
the amount of water that covers the Earth’s
surface?


A. The ocean covers just over half of the Earth’s surface.

B. The ocean covers less than half of the Earth’s surface.

C. Water covers over 95 percent of the Earth’s surface.

D. Water covers 75 percent of the Earth’s surface.

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sponse
Which row in the chart below best describes
the active transport of molecule X through a
cell membrane?
Row
Movement of Molecule X
ATP
(1) high concentration – br low concentration used
(2) high concentration - br low concentration
not used
(3) low concentration - br higher concentration used
low concentration - br higher concentration not used

Which molecule can freely diffuse through the cell membrane?

Oxygen

Nitrogen

Hydrogen

Glucose

Solve the scrambled letter according to the clue: nlpituloo _ _ _ _ _ _ _ _ _: Litter on the ground or harmful chemicals in the water. Who answers correctly will have 30 bonus pts.

which two products are bromelain likely to produce when breaking down proteins
amino acids
fatty acid
monosaccharides
nucleic acid
polypeptides
disaccharides

Question 1 (2 points)
How did we define homeostasis?

Question 1 options:

Actively changing due to an environmental stimulus


Taking “raw” materials and turning it into a usable energy


The ability to increase in size and complexity


Regulation of bodily functions to stay within a certain range

Question 2 (2 points)
Saved
A hypothesis can be described as

Question 2 options:

a testable explanation.


a theory.


a law.


a wild guess.

Question 3 (2 points)
You notice you begin to sweat whenever the door to your bedroom is closed. This is most closely related to which step in the scientific method?

Question 3 options:

making an observation


forming a hypothesis


forming a conclusion


recording data

Question 4 (2 points)
In an experiment, the variable being tested or changed is the

Question 4 options:

control variable


dependent variable


responding variable


independent variable

Question 5 (1 point)
Match each of the following terms with the correct definition?

dependent variable


controls or constants


independent variable


hypothesis

1.
An testable explanation to explain a natural phenomenon

2.
the variables that are held constant in an experiment

3.
the variable that is measured as data in an experiment

4.
the variable that is controlled by the experimenter

Question 6 (2 points)
Some chickens lay an egg every day. Other chickens produce few eggs. A study is planned to examine some factors that might affect the number of eggs produced by chickens. Which of the following is NOT a suitable hypothesis for the study?

Question 6 options:

If the cage for the chickens is larger, they will produce more eggs.


If more eggs are produced by the chickens, they will lose more weight.


If there is more protein in the feed, then more eggs are produced.


If chickens receive more hours of light, then they will produce more eggs.

Question 6 (2 points)
Some chickens lay an egg every day. Other chickens produce few eggs. A study is planned to examine some factors that might affect the number of eggs produced by chickens. Which of the following is NOT a suitable hypothesis for the study
If the cage for the chickens is larger, they will produce more eggs.


If more eggs are produced by the chickens, they will lose more weight.


If there is more protein in the feed, then more eggs are produced.


If chickens receive more hours of light, then they will produce more eggs.

Sam wished to investigate how fertilizer run-off affects the growth of algae in freshwater lakes and streams. He set his experiment up as follows. He placed 900 ml of water into each of five 1000 ml glass beakers. To each beaker, he added 5 ml of water from an aquarium which contained a large concentration of algae. The beakers were placed under a lamp which was on a timer to provide 12 hours of light each day. Liquid fertilizer was added to the beakers in the following amounts.

Each week, a random sample from each of the beakers was examined under a microscope to get a count of the number of algal cells present.

What is the independent variable in this experiment?

In the box provided explain why living organisms
contain more hydrogen atoms than any other
atoms, yet 65% of a typical organism's mass is
oxygen
І

Please help
DNA provides

A
storage for cellular waste.
B
a structure for the shape of each cell.
C
nutrients for the cell.
D
the genetic material of living organisms.

Raising the temperature of a gas will increase its pressure if the volume of the gas

Nitrogen in the atmosphere exists in the form of _____.


NO2

NO3-

NH4+

N2

NH3

HELP PLEASEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE

The difference between an community and an ecosystem is that an ecosystem includes abiotic factors

Question 15 options:
True
False

what are the 3 major purposes for the cell cycle

if a human eats salmon, will the atoms from the salmon protein still exist inside the person?​

Ten fish have lived in a 10-gallon fish tank for 6 months. However, within 2 weeks of adding 6 new fish, the population of fish drops to 7
fish. Which most likely accounts for this drop in the fish population?
A. The additional fish increased the water level.
B. The additional fish reduced the space per fish.
C. The additional fish increased the water temperature.
D. The additional fish reduced the carbon dioxide levels.

1. The chemical equation for photosynthesis is shown below is incomplete
6H20 + ______________ energy C6 H12 O6 + ________________
Plant pigment
a) Complete the equation in either all words or all symbols.
b) Name the plant pigment necessary for this reaction
2.

Name the tissues labelled A………………….., B………………… and C…………………..(3M)
3. Complete the table by matching each of the described functions to one of the leaf parts as shown in above diagram (4M)
Description of function Leaf part
Main region for photosynthesis. Contain
many chloroplast to trap light energy.
Cells are loosely packed. Air spaces between cells allow gaseous exchange.
Thin and transparent layer that allows light to pass through.
Water vapor passes out during transpiration.
If question 2 is not answerable or if the picture is missing then leave it

Which THREE processes are involved when a multicellular organism reproduces sexually? a. mitosis b. fusion of gametes c. meiosis d. formation of gametes. Pls help yall!!!​

Which of the following describes how both of these cellular division processes maintain genetic continuity?
А.Both processes involve the replication and division of identical genetic material.
B. Both processes creates cells with half the genetic material of the parent cells.
C. Both process involve the recombination and division of new genetic material.
D. Both processes create cells with twice the genetic material of the parent cells.

1.270 calves were born from gray-variegated cattle. Of these, 136 have parental coloring. Determine the genotype and phenotype of the rest of the offspring, if it is known that the gray-variegated coloration occurs when crossing black and white individuals.

2.In some breeds of sheep there are animals without ears and animals with long ears. When they are crossed, animals with short ears are obtained. What offspring will be obtained by crossing short-eared animals and by crossing short-eared rams with long-eared sheep?

Which substance is harmful in drinking water at any amount?

A) Nitrates
B) Pesticides
C) Charcoal
D) Coliform Bacteria

PLZZZ HELP!!! I NEED HELP DESPERATELY!!
What is the gain of FADH₂ per pyruvic acid in the citric acid cycle?

what is not a characteristic of life?
•obtaining and using energy
•maintaining homesostasis
•having cells
•movement​

Rachel types 162162162 words in 333 minutes. Rachel types at a constant rate. How many words does Rachel type per minute?

Which statement explains a difference between a cell wall and a cell membrane?

What are the possible results of gametes receiving the wrong number or proportion of chromosomes during meiosis II? Select all that apply.

A) zygote that cannot survive
B) gametes with one copy of chromosomes
C) two new nuclei forming during cell division
D) medical conditions for the offspring