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If it were not for the automatic stabilizers in the U.S.economy,
Microevolution
Evolutionary change within a species or small group of organisms, especially over a short period.
Hybrid Inviability
A postzygotic reproductive isolating mechanism in which the embryonic development of an interspecific hybrid is aborted.
Mutation
A change in the DNA sequence within an organism's gene or chromosome, leading to variations in trait expression and possibly to different phenotypes.
Habitat Isolation
A type of prezygotic barrier where two species that could interbreed do not, because they inhabit different habitats and rarely encounter each other.
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