3.1 Mastery Check

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Definition of a species

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A population of organisms that can interbreed and reproduce

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Estimated species on Earth

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5-30 million

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Endangered species: immediate extinction risk

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Threatened species: less risk than endangered

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Causes of speciation

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Natural selection and adaptation to environments

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Interspecific competition

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Competition within species

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Competitive Exclusion Principle

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One species dominates; the other has small populations that may relocate.

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Types of isolation causing speciation

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Behavioral, mechanical, temporal, geographic

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Speciation

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