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

使动物以脱离水生的进化步骤是羊膜进。

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PBS地球-动

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， 这些早期的羊膜动可在远离水的地方自由繁殖，它们产下带有的卵，这些卵可能比矿化的更坚韧。

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3G, 401(K), a,
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