Biology / Bio 1643 · Atom · ~20 seconds
Natural Selection Defined
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Natural selection, per Unit 1's Bio 0056, is the differential survival and reproduction of individuals whose heritable traits better suit their environment.
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Individuals whose inherited traits improve survival and reproduction leave more descendants, so those traits become more common next generation.
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"Survival of the fittest" misleads if read as only the strongest or fastest — fitness means reproductive success, not physical dominance.