why the marsupials produce immature babies?
Answers
Because of this earlier birth relative to developmental stage, other parts of the body also are very immature in newborns. The major limb joints and others are still made of cartilage, not bone. The nervous system is so poorly developed there is scarcely any visible difference between the gray and white matter of the brain. Nerves as yet have relatively little myelination, so they are not very good at conducting signals. For this reason, newborns don’t have the motor coordination to hold things in their hands, to walk, or even to stand up or sit up.
This relative helplessness and neediness of newborn humans acted, in turn, as a selection pressure mandating care by two parents. In our prehistoric ancestors, if a male abandoned his mate and child, they probably would die and he would have no reproductive success. So there was a strong selection pressure for men to stay with their mates.
Human babies and children also take a long time to rear, both because of their initial helplessness and because the complexity of human society requires a long learning curve. If children were abandoned almost as soon as they were weaned, they would not survive. And over the time course of rearing one child, the mother is likely to have more babies, prolonging the need for parental care even further.............
i hope it help u............@kundan
They are mammals because they have fur and give milk. They are marsupials because they have pouches where their babies live after they are born. The babies need a pouch because they are born very early, when they are not really ready to be outside their mother.