Exercise increases a chemical in the body known as , which moderates the brain's Exercise increases a chemical in the body known as

response to stress.

A cortisol

B norepinephrine

C oxytocin

D insulin

Viruses ) manufacture their own atp, proteins, and nucleic acidsb) use the host cell to copy themselves and make viral proteinsc) use the host cell to copy themselves and then viruses synthesize their own proteinsd) metabolize food and produce their own atp