Adaptation - a modification of an organism or its parts that makes it more fit for existence. An adaptation is passed from generation to generation., Arid - dry., Desert - area of land that receives no more than 25 centimeters (10 inches) of precipitation a year., Biome - area of the planet which can be classified according to the plant and animal life in it., Climate - all weather conditions for a given location over a period of time.,

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