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| The diversification of a group of organisms into forms filling different ecological niches. |
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| Behavioral adaptation is an adaptation that helps an organism enhance either survival or reproduction. |
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| The evolution of similar looking or similar functioning structures in unrelated animals. |
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| when two or more biological characteristics have a common evolutionary origin but have diverged over evolutionary time. |
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| Variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce |
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| Separation of populations of a species by geographic means |
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| belief that evolution proceeds at a steady pace, without the sudden development of new species or biological features from one generation to the next |
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| An organismic or systemic response of an individual to a specific external stimulus in order to maintain homeostasis. |
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| The hypothesis that evolutionary development is marked by isolated episodes of rapid speciation between long periods of little or no change. |
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| lack of interbreeding between the individulas of the same species due to different time or pattern of reproduction |
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| the structural adaptation of some body part for a particular function |
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| taxonomic group whose members can interbreed |
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| Specific traits influenced by environmental factors |
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