Lichen growing on newly formed lava beds is an example of _____.A. a primary ecosystem

B. evolutionary succession

C. primary succession

D. secondary succession

Answers

Answer 1

Answer:

Answer:

answer, I guess, is C.primary succession

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What is the definition of commenalism?

Answers

It's basically when one thing gets a benefit without harming/effecting the other thing!

I guess is
It compares with mutualism, in which both organisms benefit, amensalism, where one is harmed while the other is unaffected, and parasitism, where one benefits while the other is harmed.
In ecology, commensalism is a class of relationship between two organisms where one organism benefits without affecting the other.

A model of pluripotent vs differentiated cellular gene expression is shown. Pluipotency is found in stem cells that have the ability to become multiple types of cells. Differentiation is the process where a cell becomes specialized and cannot return to its pluripotent state. What explanation best supports the model of pluripotency and differentiation shown above?A) Differentiated cells have different DNA sequences that pluripotent cells and can produce different protein products.
Eliminate
B) Differentiated cells have fewer gene sequences that pluripotent cells and can only produce limited numbers of proteins.
C) Pluripotent cells recruit molecules from nearby cells to increase gene expression while differentiated cells use only internal transcription factors.
D) Differentiated cells and pluripotent cells have different types of activator or repressor proteins present that positively and negatively regulate gene expression in the cell.

Answers

Answer:

The correct answer is D

Explanation:

Answer:

Explanation:

i just got it right on usatestprep

Autosome are ____ chromosomesA. Nonsec
B. Homologouns
C. Abnormal
D. Haploid

Answers

Autosomes are the non-sex chromosomes.
Hope this helps :)

my guesses would be either A or B

ASAP plzzz 16. How do the moon's phases depend on the relative position of the sun, moon, and the earth ???

17. Describe both the Earth's rotation and it's revolution. How do they differ???

Can whoever is answering do AT LEAST 2 SENTENCES plzzz
If u do thx so much :D cx

Answers

16. The moons phases depend on how much the earth blocks light between the sun and the moon. The phases depend on where the moon is in respect to the sun in space.

Describe the flow of blood in the human body, including through each of the four chambers of the heart.hey...can someone help me with this lol, i dont really know.

Answers

Well , the humans have a closed double circulatory system as the blood passes by the heart twice per one cycle and doesn't leave the blood vessels like in insects.
》Pulmonary circulation : Blood is circulated to the lungs where it is oxygenated.
》Systemic circulation : Blood is circulated through all the other parts of the body where it unloads oxygen.

Oxygenated blood coming from the lungs enters the heart through the pulmonary vein which takes blood to the first chamber it meets ; the Left atrium. Left atrium pumps blood to the second chamber , which is left ventricle and during this time , the semi lunar valves are closed to prevent back flow of blood and the bicuspid valve will be open . Now , the left ventricle is filled with oxygenated blood so it will pump this blood to the whole body via the largest artery which is Aorta.
Oxygenated blood will unload oxygen to cells in need of it and will return back now to the heart as deoxygenated . This deoxygenated blood will enter the heart through superior and inferior vena cava which will take the blood to the third chamber , right atrium . Right atrium will pump blood to right ventricle so the semi lunar valves will be closed during this time and the tricuspid will remain open. Now that the fourth chamber is filled with deoxygenated blood , it will pump this blood through pulmonary artery when the semi lunar valves opens , to the lungs again to be oxygenated once more.

Notice that you have to know exactly the position of the valves that I have mentioned in the heart so that you could understand the blood flow better. You can refer to any heart labelled diagrams in your textbook or the internet.

An allele whose trait is masked in the presence of a dominant allele is called