Eli5: how is it that so many species, including humans, have the same motherly instinct that suddenly appears after birth? Where does this come from?
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It is an instinct ingrained in our DNA. From the moment species started requiring mothers to take care of babies for the species to survive, the individuals with the more motherly genes/tendencies were more likely to keep their babies alive and pass on those genes. So over a long long long time you are left with only the individuals who have those motherly tendencies/instincts ingrained in their DNA.
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