| 21. | Placental mammals lost both the mid and short wavelength cones.
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| 22. | "It's the first branch of the entire placental mammal tree,"
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| 23. | Why are placental mammals " non-optimal " this way?
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| 24. | Although they are placental mammals, colugos raise their young in a similar fashion to marsupials.
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| 25. | The msrY is the male-specific region of the Y chromosome in marsupial and placental mammals.
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| 26. | The interclavicle is absent in marsupials and placental mammals.
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| 27. | In placental mammals, these three systems are more separated.
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| 28. | Usefully, humans express conserved syntenic chromosome organization similar to the ancestral condition of all placental mammals.
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| 29. | This is a feature of all non-placental mammals.
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| 30. | Additional perspective came when reduced thermal regulation was observed in the hyraxes, which are placental mammals.
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