Which of the following choices is NOT a consequence of incomplete combustion? A. Heavy metals leaking into groundwater and damaging the nervous system.
B. Carbon monoxide blocking oxygen in the blood.
C. Carbon particles making buildings dirty.
D. Carbon particles causing breathing problem

Yapo 13 fool coming at you for it

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 .