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Species' longevity depends on brain cell numbers

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Scientists have thought that the main determinant of maximal longevity in warm-blooded animals — which varies from as little as 2 to as many as 211 years — is a species’ metabolic rate, which is inversely related to body size. It follows that at 2 years of life, small animals with high metabolic rates are already old, but large animals with low metabolic rates are still young.

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