In frogs, different mating seasons are a barrier to reproduction.
Explanation:
Monomers are small molecules, mostly organic, that can join with other similar molecules to form very large molecules, or polymers. Polymers are chains with an unspecified number of monomeric units. a polymer. Homopolymers are polymers made by joining together monomers of the same chemical composition or structure.
I think the answer is evolution.
The answer is: "12 (twelve)" .
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Note: 24 / 2 = 12 .
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