脑洞大开的问题

If humans are shot to death for the next 100,000 years, would they evolve to have bulletproof skin?

如果在接下来的 100000 年内一直用枪杀死人类，那么人类会进化出防弹的皮肤吗？

原文地址：https://www.quora.com/If-humans-are-shot-to-death-for-the-next-100-000-years-would-they-evolve-to-have-bulletproof-skin

Antony Pateman:

Here's evolution simplified:
简而言之，进化是这么回事：

Twenty people sit on the shore of a lake. The lake is wide, let's say thirty miles, bank to bank.
有 20 个人坐在湖边，湖很宽，我们就假设从这边到那边有 30 公里。

Suddenly a big monster appears, wanting to eat twenty people.
突然出现了一直怪兽，想要吃掉这 20 个人。

The twenty people dive into the water and swim for their lives.
这 20 个人就跳进湖水中来保命。

Sadly, not all swimmers make it across. Maybe their feet are small and so they can't propel themselves across the water so well. Maybe their lungs aren't so strong and so they become exhausted, and they drown. So long. Bye bye. Gone. Not just the people, but their genes too, poor lungs, little feet.
遗憾的是，不是所有人都能游这么远。或许是因为他们的脚有点小，也或许是因为他们的泳技不是那么的好。或许是因为他们的肺功能不够强壮，然后疲劳过度被淹死了。因此，不仅仅是这些人，还有他们身上的基因也随之消亡，不够强壮的肺，小脚。

But some make it across. They had strong lungs, larger, wider feet.
So let's say ten made it across, five males and five females.
但有人成功渡过了湖水。他们又强壮的肺，更大更宽的脚。我们假设有 10 个人成功渡过了湖面，五男五女。

You know how a son can look like his father and mother at the same time? Well it works with feet too.
你知道一个孩子在外貌上会与父母存在多大的相似度吗？在脚上也会反应出来。

So man and woman combine, strengthening the genes which allowed them to get across the water.
所以男人和女人结合，加强他们的基因以让他们能够成功地渡过水域。

And of course ten made it across, five pairs. These peoples offspring will be more adapted to water.
当然有 10 个人成功地渡过湖水，五队。这些人的后代将会对水有更高的适应性。

That's evolution.
这就是进化。

We can't “evolve” bulletproof skin. It doesn't work that way.
我们并不能进化出防弹皮肤，进化并不是这样的。