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mammals × 67evolution × 26
science-based × 22
biology × 20
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alternate-earth × 17
internal-consistency × 9
adaptability × 8
alternate-history × 5
reproduction × 5
xenobiology × 4
environment × 3
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anatomy × 3
reptiles × 3
fauna × 2
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biochemistry × 2
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ecology × 2
agriculture × 2
extinction × 2
insects × 2
prehistoric-times × 2
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