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Why are the offspring of older mothers less apt to live and prosper?

Rotifer mother (Brachionus manjavacas) carrying four eggs (right) and newborn daughter (left). Image of live rotifers acquired by polychromatic polarization and phase contrast. Credit: Michael Shribak, Evgeny Ivashkin, Kristin Gribble The offspring of older mothers do not fare as well as younger mothers, in humans and in many other species. …

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