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脊椎動物化石哺乳動物概論

the fossil evidence we know that during the Mesozoic Era the early mammals were very small insize.....more

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molar crowns with small blunt tips. This structure is presumably suitable for chewing vegetations.....more

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. The appearance of incisors looked much like Mammuthus , but with small curve not big one. Fossil.....more

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is a small sized and slender whale, its skull extends into an obtuse, bluntly-tipped beak. It has 8 to .....more

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