| 1. | Virtually every other mammal in its environment was a placental eutherian.
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| 2. | :Whales are eutherian mammals, and thus do not lay eggs.
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| 3. | Even non-placental eutherians probably reproduced this way.
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| 4. | Bandicoots are also the only metatherian marsupials that have placentas similar to eutherian mammals.
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| 5. | The high iron content and low levels of free lactose differ from eutherian mammals.
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| 6. | Tooth enamel evolved differently in marsupials and eutherians.
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| 7. | The weakly favoured cladogram favours Boreoeuthearia as a basal Eutherian clade as sister to the Atlantogenata.
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| 8. | Although " Maelestes " was a eutherian, it was not a placental mammal.
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| 9. | The Jurassic was the height of archosaur diversity, and the first birds and eutherian mammals also appeared.
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| 10. | Eutherians are distinguished from noneutherians by various phenotypic traits of the feet, ankles, jaws and teeth.
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