Which one of the following characteristics is | vedclass

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(A) : Viviparity is not a shared characteristic. All birds are oviparous (egg-laying),whereas most mammals are viviparous (giving birth to young ones)

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Viviparity

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(A) : Viviparity is not a shared characteristic. All birds are oviparous (egg-laying),whereas most mammals are viviparous (giving birth to young ones). Exceptions among mammals include monotremes like $Ornithorhynchus$ (duck-billed platypus) and $Tachyglossus$ (spiny anteater),which are oviparous. However,since the majority of mammals are viviparous and all birds are oviparous,viviparity is not a common trait shared by both groups.

Which one of the following characteristics is not shared by birds and mammals?

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