Fossilized remains of Acanthostega, a primitive fish, reveal that even though the animal had rudimentary limbs, it could not walk on land.
棘螈是一种原始鱼类，它的化石遗迹显示，尽管棘螈有基本的四肢，但它却不能在陆地上行走。
This ability may date back to even more primitive organisms than fish.
动物的识数才能甚至可以出现在比鱼还原始的生物中。
Many primitive lineages went extinct as sharks and bony fish became masters of the waters and tetrapods, the four-legged animals that eventually evolved into dinosaurs and mammals, conquered the land.
许多原始生物灭绝，鲨鱼和硬骨鱼成为水域的主人，四足动物最终进化成了恐龙和哺乳动物，征服了陆地。
These ancient fish may have been among the earliest animals to evolve more complex, camera-like eyes as opposed to the strictly photosensitive vision possessed by more primitive species.
与更原始的物种相比，他们照相机似地眼睛已经已经不仅仅只具有光敏视觉了，或许这种古老的鱼类是最早一批想要进化的更复杂的物种之一。
Fish, some amphibians and primitive egg-laying mammals such as the duck-billed platypus use similar pits to pick up electric fields generated by nearby animals.
鱼，一些两栖类和原始的产卵的哺乳动物，如鸭嘴兽，使用类似的凹陷获得附近的动物产生的电场。
Fish, some amphibians and primitive egg-laying mammals such as the duck-billed platypus use similar pits to pick up electric fields generated by nearby animals.
鱼，一些两栖类和原始的产卵的哺乳动物，如鸭嘴兽，使用类似的凹陷获得附近的动物产生的电场。
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