What two features do mammals have that other vertebrates do not have
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Among the features that distinguish them from the other amniotes, the reptiles and the birds, are hair, three middle ear bones, mammary glands in females, and a neocortex (a region of the brain). ... All female mammals nurse their young with milk, which is secreted from special glands, the mammary glands.
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Among the features that distinguish them from the other amniotes, the reptiles and the birds, are hair, three middle ear bones, mammary glands in females, and a neocortex (a region of the brain). ... All female mammals nurse their young with milk, which is secreted from special glands, the mammary glands.
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