What is the relationship of tissues to cells? Tissues make cells.
Cells make up tissues.
Tissues are use for cell growth.
Cells help tissue grow.

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 .

Ithink that the answer is b