这些适应机制在它们的后代进化成陆生生物时起了很好的协助作用。
These adaptations served their descendant well as they invaded land.
森林是80%陆生生物的家园。
这就是为什么较大的陆生生物需要在比例上更粗壮的腿来承受自身的重量。
This is why larger land organisms need to have proportionally thicker legs to support themselves.
现在它们已经是标准的陆生生物了，四肢都有五趾，无需借助海水的浮力即可支撑身体。
They are now proper terrestrial animals, possessing five-digit limbs powerful enough to support them without the assistance of water's buoyancy.
我们目前已经描述过的物种数量为120万种，其中大多数为陆生生物，总数多于海洋生物。
About 1.2 million species have been formally described, the vast majority from the land rather than the oceans.
我们目前已经描述过的物种数量为120万种，其中大多数为陆生生物，总数多于海洋生物。
About 1.2 million species have been formally described, the vast majority from the land rather than the oceans.
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