It's one of the really mysterious things about humans, the fact that we live these super-long lives as compared to so many other mammals... a part of the explanation for our long lifespan is this other foundational aspect of our lives, which is the relationship between the mother and her child.
As we see these links between maternal survival and offspring fitness grow stronger, we see the evolution of animals having longer lives and reproducing less often -- the same pattern we see in humans.
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