<span>a.Prenatal stage of a human up to 8 weeks of development after fertilization.
Hope this helps!</span>
answer is d hope this can help
The answer is c02 regulation, the carbonic acid bicarbonate buffer regulation, the H+ regulation and gas exchange. The following regulations are all completed through the circulatory, excretory and respiratory systems which is part of one huge function that is called homeostasis. Homeostasis is the predisposition to repel alteration in order to uphold a even comparatively constant internal situation.
They both release CYTOKINES :)
Haha :) I know this is right because I just got quizzed on it before spring break
Answer:
the environment and parasites
