Answer:
what cnidarians you need to spell right
A base substitution of G:C to A:T after two rounds of replication.
Answer: When the plant has enough water in its cells the guard cells swell up and open the stomata. When the plant isn't getting enough water the guard cells can't swell and the stomata stay closed, so the plant doen's lose water. But if the stomata are closed photosynthesis can't happen and eventually the plant might starve.
Explanation:
Kidney. The kidney plays the role of keeping blood pressure in check by altering the blood volume.
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