acid rain, any form of precipitation that has high levels of nitric and sulfuric acids, adaptation, a trait that helps an organism survive in its environment, behavior, an organism’s response to a stimulus, change, to make something different from what it is now, heredity, the passing on of traits from parents to children, inherit, to receive a trait from your parents or ancestors, life cycle, the series of developmental stages an organism passes through on its way from birth to death, pollution, any substance that has harmful effects on the environment, predator, an organism that eats another organism, reproduction, the ability of a mature organism to have offspring, stability, a condition in which the parts of a system are unchanging, trait, a physical or behavioral characteristic of an organism.

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