The evolutionary step that freed these animals from the water was the development of the amniote egg.
使这些动物得以脱离水生活的进化步骤是羊膜卵得改进。
动物,羊膜动物The evolutionary step that freed these animals from the water was the development of the amniote egg.
使这些动物得以脱离水生活的进化步骤是羊膜卵得改进。
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