Many of the proteins in the human body are enzymes that catalyze chemical reactions. what is the relationship between enzymes and activation energy?

it would lead to upper respiratory infections and pneumonia.

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands