The evolutionary step that freed these animals from the water was the development of the amniote egg.
使这些动物
以脱离水生活的
化步骤是羊膜卵
。
词The evolutionary step that freed these animals from the water was the development of the amniote egg.
使这些动物以脱离水生活的化步骤是羊膜卵。
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