It's exactly as simple as natural selection. Because a language is not just expressing thought - it's driving it as well. Actually, it's exactly as the whole ev

It's exactly as simple as natural selection. Because a language is not just expressing thought - it's driving it as well. Actually, it's exactly as the whole evolution in the animal world: languages are inheritable (parents teach their language to the children at the very least), mutable and there is a selection process among them, involving armies and navies among many other things.