Which statements describe proper use of a filter funnel? check all that apply. cut the filter paper in half before placing it in the funnel. fold the filter paper in fourths before placing it in the funnel. pour all the liquid through the funnel. trap the liquid in the center of the filter.

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 .