_____________ is the introduction of harmful materials into the environment.

A resource that can be renewed easily if used wisely.

A resource that is limited in supply and cannot be replaced easily once it has been used.

A dangerous pesticide no loger used in the USA.

A specific area where living and nonliving things interact.

The act of using a resource wisely.

Animals with very small numbers that are in danger of becoming extinct.

A nonrenewable resource formed by the remains of organisms that lived long ago.

The place where an animal lives.

The government agency that enforces laws to help protect the environment.

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