human bio variation and evolution - LESSON 3 EVOLUTION THROUGH NATURAL SELECTION
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4 Terms
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evolution
the change in the heritable traits of biological populations over successive generations
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2 scientists who proposed natural selection
charles darwin and alfred russell wallace
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speciation
where one species splits into two or more separate species (can no longer interbreed)
occurs through variation(differences develop within a species over time due to selection pressures), isolation(groups in a population are physically prevented from interbreeding), and selection (natural selection causes changes to prevent breeding)
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cycle of speciation
variation → isolation → selection → speciation
Note 
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