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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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extremely successful during the Cenozoic Era with more than 400 species spread throughout the world.....more

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reached its peak during the Cenozoic Era with over 400 different species spread throughout the world.....more

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in the Archean and early Proterozoic Era. The formations of these banded iron layers can be dated.....more

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