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The evolutionary step that freed these animals from the water was the development of the amniote egg.

使这些以脱离的进化步骤改进。

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Unlike the temnospondyls, these early amniotes were free to reproduce far from the water, by laying eggs with protective shells, which were probably more leathery than mineralized.

与穿椎动不同, 这些早期的羊膜在远离的地方自由繁殖,它们产下带有的卵,这些卵可能比矿化的更坚韧。

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