Mr. Anderson examined a sample of a substance that had a consistently measurable volume but took the shape of whatever container it was placed into. This substance could not be compressed, but it could flow and diffuse. This substance is most likely a

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 .

Your awser would be a acetone