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For mammals, why is hair a shared derived character?

valerieweizhen

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11 years ago

For mammals, why is hair a shared derived character?

why for mammals, hair is a shared derived character, but a backbone is a shared ancestral character?

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connorp

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11 years ago

A unique characteristic of mammals is that they have hair. No other clade possesses this characteristic, making it a shared derived characteristic. But, mammals are also vertebrates, in that they all have backbones. But they aren't the only clade in the subphylum Vertebrata, making a backbone a shared ancestral characteristic.

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