Why do some organisms like dogs and cats give birth to more than one offspring at a time whereas humans usually give birth to just one offspring?
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Most smaller mammals have multiple births, producing litters of young which may number twelve or more. In these animals, each fetus is surrounded by its own amniotic sac and has a separate placenta. This separates from the wall of the uterus during labor and the fetus works its way towards the birth canal.
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