Which of the following is an example of a chemical change?
A. water freezing into ice
B. a fire burning wood
C. a glass dish shattering

The answer is fire burning wood

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 .

Ibelieve it is b. proton.hope my answer has you : )