You are boiling water in a pot on the stovetop. The water at the BOTTOM of the pot heats primarily through

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 .

Ans() ; the burning of them contributes to global warmingthey come from decayed organic material;

If your on odysseyware i believe the answer would be c.