Because earth's interior is warmer than its surface layers, hot materials move toward the surface in a process called
a) energy balancing
b) convection
c) energy transfer
d) rotation

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.

The normal shape of an enzyme is as shown in structure a. if the enzyme’s shape changes to that shown in structure b, what are two consequences of this change?

Cells must be in osmotic equilibrium with their surroundings environments because if they swell or shrink thier membranes will rupture