4. A chemical or physical agent in the environment that causes a mutation is called a
A. leucism.
B. point mutation.
C. mutagen
D. polyploidy

Mutagen

Explanation:

In genetics, a mutagen is a physical or chemical agent that changes the genetic material, usually DNA, of an organism and thus increases the frequency of mutations above the natural background level. 

the cells uses some of the atoms of the glucose molecules to atp molecules. the atoms of the glucose molecules will then be converted into energy which will be eventually stored in atp. the energy produced which are stored in atp are coming from the glucose’s chemical bonds.