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Question of the Day
What is the first evidence of a new species?
Reproductive isolation is the major working criterion for species definition. If members of two different species mate, a hybrid is produced. Hybrids usually are unable to survive because of development abnormalities that keep them from maturing. Reproductive isolation remains the major criterion in defining a species.
Reproductive compatibility
Reproductive isolation
Punctuated equilibrium
Hardy-Weinberg equilibrium
Sympatric speciation
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