they are different to those of other fish. 叶鳍与其他鱼的鳍不同
...which has evolved in countless different directions. 这种结构向无数不同方向进化
escaping predation required a different approach. 逃避被捕食需要一种不同的方式
Triceratops is very different to the defenseless Maiasaura. 三角龙 与无防御能力的慈母龙非常不同
until eventually, one will be so different to its predecessors 直到最终与其祖先截然不同
But each has a different combination of genes 但每一颗都具有不同的基因组合
but all with totally different origins. 但起源完全不同
Two million years ago, and our planet is a very different place. 200万年前 我们的星球与现在完全不同