I believe a lot of our human behavior is rooted in our biology. For example, look at pregnancy and birth in women and apes. Both carry the babies for a long gestational period, thereby creating an indescribable bond with the offspring. The nurturing behaviors displayed after birth are common in both species. I believe that has to do with our biology. I guess there is a technical exception to this, when you regard surrogates. I assume they also feel some form of nurturing behavior after the baby is born, but they understand and know that the baby is not really theirs to rear.
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