All of the following are orders of placental mammals except

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Marsupialia is not an order of placental mammals. Marsupials differ from placental mammals in that they give birth to relatively undeveloped young, which then complete their development outside the womb, typically within a pouch on the mother's belly. Placental mammals, on the other hand, have a longer gestational period and give birth to more fully developed young. The other choices, primates, rodentia, cetacea, and carnivora, are all orders of placental mammals.

All of the Following Are Orders of Placental Mammals Except