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rodents × 12mammals × 6
zoology × 3
species-identification × 2
behaviour × 2
teeth × 2
human-biology × 1
evolution × 1
biochemistry × 1
ecology × 1
vision × 1
ethology × 1
anatomy × 1
chromosome × 1
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sex × 1
circadian-rhythms × 1
agriculture × 1
lifespan × 1
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polyploidy × 1
antipredator-adaptation × 1