Which hormone functions in the regulation of the body's metabolic rate?
a. insulin
b. thyroid hormone
c. vitamin d
d. glucagon

What re the two main phrases of the cell cycle.

Of the pollutants that form acids in the atmosphere, which is easiest to reduce? a. sulfur dioxide b. nitrogen dioxide c. ozone d. carbon monoxide

Are salt and soap nutrients or toxins for yeast? explain.