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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