Eli5 Why is the gestation period of each mammal different? Opposum only need 12-13 days but why do we get 9months?
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Marsupial young are born very early. They are a more primitive type of mammal and go to the pouch to continue development. Other mammals are at various developmental levels at birth. A deer can walk minutes after birth. A human will take around 9 months to a year to walk after birth.
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