Unit SummaryOrganisms possess a variety of traits that increase their likelihood of survival. However, some traits of organisms change over time (generations) due to human and environmental influences. Those traits may be structural, behavioral, or physiological in nature. Organisms that do not adapt to changes in the environment may not survive. Organisms' traits may also be manipulated by humans in order to produce specific and desired outcomes. A dichotomous key is used to identify organisms based on observable traits.
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