3 ms·

Well, hold on there: natural selection is not always so simple. Older adults take care of their own as well as the extended family's offspring, providing a mech

• londons_explore 7y ago
  It's also negative natural selection if Aunt Anna is very old, can barely walk, is losing her mind, yet still eats all the food the children grow ...
  • rjurney 7y ago
    For a short time but caring for the sick has benefits overall and granny had years of productivity after fertility.