In a balanced equation, there will be the same number of atoms on the reactant side as there are on the products side. What is this an example of?
A. Electronegative viability
B. Law of Conservation of Mass
C. Law of Atomic Rearrangement
D. Chemical Formulas

Iwould google this

Ithink d hope that

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 .

The answer is b because c don't explain why the moths are on them and it isn't a because as we know only one species of moth does this