bre Inside Outside Cold Pack Powder Squeeze Here 1 Liquid Which is the BEST explanation why the temperature of the pack decreases when the liquid and powder combine? A mixture forms. A solution forms. A chemical change occurs: Thermal energy is used.

Ithink it's carbonic acid

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 .