| 11. | Although " Maelestes " was a eutherian, it was not a placental mammal.
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| 12. | Male placental mammals have nonfunctional nipples, so do male marsupials have them, as well?
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| 13. | Unlike placental mammals, male marsupials have a scrotum that is anterior to the penis.
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| 14. | The milk contains a higher amount of iron than the milk of placental mammals.
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| 15. | Placental mammals evolved a discrete motor cortex about 100 mya.
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| 16. | In marsupial and placental mammals, copulation occurs through the vagina.
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| 17. | Differences exist between the cleavage in placental mammals and the cleavage in other animals.
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| 18. | Placental mammals were also found in North America and South America at this time.
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| 19. | Modern monotremes have a low body temperature compared to marsupials and placental mammals, around.
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| 20. | There marsupials evolved to fill the gaps left by the absence of placental mammals.
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