Placental mammals give birth to more fully developed offspring than marsupial mammals and therefore have a greater chance of survival.This helps to explain why placental mammals from North America displaced many native South American marsupial mammals when a land bridge formed between the two continents.

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Placental mammals have a longer gestation period and give birth to more fully developed offspring, which gives them a greater chance of survival compared to marsupial mammals. This advantage helped placental mammals from North America displace many native South American marsupial mammals when a land bridge formed between the two continents.

Placental Mammals Give Birth to More Fully Developed Offspring Than