If the need for homeostasis applies to cells, and the cell membrane controls what goes in and out of the cell... How could the cell membrane then be important for homeostasis?

c. would be the answer : )

explanation:

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products

cells spend most of their time in interphase