How can humans decrease the rate of endangered or extinct species? question 4 options: introduce new predators to an environment. minimize habitat destruction. pollute other environments. create and populate more zoos.

Minimize habitat destruction so the animals have more space to breed.

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 .