Zack is four years old and can do cartwheels, back flips, back hand springs, and one-handed cart wheels. he has had no formal training to develop these gymnast skills. all represent:

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.

Chicken pox and hepatitis are bacterial diseases. true or false?

Penelope studies how the structure and function of the nervous system is related to behavior. she is a psychologist