If you want a good example of this difference, look at the sea squirt.

如果你想要一个关于这种差异好，就看看海鞘。

To illustrate this, Daniel uses the example of a sea squirt.

为了说明这一点，Daniel 举了一个海鞘。

The skeleton panda sea squirt officially recognized even though " a-panda-ntly."

官方名字是骨架熊猫海鞘，很明显。

Early in its life, the sea squirt has a nervous system.

在其生命初期，海鞘长有一个神经统。

That's right – once a sea squirt doesn't need to move anymore, it basically eats its own brain.

没错——一旦海鞘不再需要移动，它就会吃掉自己大脑。

The skeleton panda sea squirt, the distinctive sea squirt first caught the attention of a researcher in 2018.

骨架熊猫海鞘，这种海鞘在2018年首次引起了一位研究人员注意。

At that point, movement is no longer a necessity for survival, so the very first thing that the sea squirt does is it digests its brain for energy.

此时，运动不再是生存必需，所以海鞘定居下来以后第一件事，就是把它自己大脑吃掉为身体提供能量。

Some years I'll get biofouling, like sea squirts and things will stick to it really early, which really affects whether I can use it for food.

有几年我会被生物污染， 比如海鞘，而且东西很早就会粘在上面，这真会影响我是否可以用它做食物。

While birds nest among mangrove branches, fish lay eggs amidst their sprawling, complex root systems. Symbiotic sponges and sea squirts protect their host trees from hungry woodboring crustaceans.

鸟儿在红树林树枝间筑巢，鱼儿则在它们庞大而复杂根中产卵。共生海绵和海鞘保护它们寄主树免受饥饿钻木甲壳类动物侵害。