The risk of injury in a car accident is much greater if occupants do not wear a seat belt. Which of Newton's laws explains why this is true? * A) Law of inertia
B) Law of force and acceleration
C) Law of action-reaction
D) Law of gravity

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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 .

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