How does a cell maintain homeostasis? A. Regulates what enters and leaves the cell
B. Structure and support
C. Flexibility
D. Protective barrier

Animal bodies (and even plant bodies for that matter) are complex enough that life couldn't exist without enzymes. enzymes are usually large, complex biological catalysts that are expensive to make. enzymes speed up the rate of chemical reactions without being used up during the reaction (they can be reused many times). they are highly specific in the reactions they regulate. knowing what enzymes are and how they function, why does this explain why complex life forms could not exist if there were no enzymes.

Modern whales developed their traits through natural selection what occurs during the process of natural selection

I’m stuck on this question cuz i’m stupid sksksksk