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Scientists measured the beak length of a population of
birds in a lake in 1960. They measured the beak length of
the bird population again in 2010. When was there more
variation in the beak lengths of the birds by the lake?

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 .

C. control over the business