All of the following methods can preserve the environment except recycling. reducing the use of fossil fuels. using energy efficient technologies. disposing of animal waste in ground water.

Disposing of animal wastes in ground water doesn't help preserve the environment.

It was ernest rutherford

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 .