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21. To establish that evolution by natural selection is operating in a population, one must demonstrate variability fora trait, heritability, and which of the following?A) progressB) differential reproductive successC) increased complexity of an organismD) random matingE) continuous change in the environment
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- The environment determines which phenotypes are favorable. If an environment changes, or if individuals move to a new environment, natural selection may result in different phenotypes being favored.