a scientist thinks that a certain chemical is a mutagen. she exposes plant cells to a large amount of this chemical in the laboratory. which statement best provides evidence that the substance is a mutagen?

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .

C. chemical changeshope i : )

The answer is b because a,c,and d are opinons

A. ​it generates energy from carbohydrates.b. it requires activation by oxygen.​c. ​it is used by cells to dispose of excess electrons