What was Robert Hooke's contribution to cells? a. He developed the cell theory by himself.
b. He was the first person to use the term "cell".
c. He was the first person to build a microscope.

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.

What causes the force that pushes magma from the magma chamber through the pipe and vent of a volcano?

Why has two different alleles for the same trait?