Needs & Characteristics of Living Things

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Main energy source for most organisms is

Process by which living things produce more organisms like themselves

A balance must exist between an organism's energy producing processes and its energy using processes.

Animals whose body temperature changes with the environment (cold blooded).

A change in an organism's environment that causes a reaction is called a(n)

Characteristic or trait that allows an organism to survive and reproduce in its enviroment

Animals that maintain a stable body temperature (warm blooded).

An organism's ability to maintain stable internal conditions is called