The interesting thing is that we somehow manage to cope with all this complexity, both as individuals, and as a society, and survive. When you look at all the details, and all the things that can go wrong, it looks like maybe it wouldn't be possible.
Also at a natural (non-man made) level, the complexity of biochemistry and the need to get 30 trillion or so cells working together as a single animal, in the presence of another 30 trillion or so single-celled organisms of random species, doesn't really seem like something that's going to succeed.
> to get 30 trillion or so cells working together as a single animal
It's no coincidence then that your brain has a circuit to create backwards explanations for behavior that you didn't initiate, it helps create the illusion that you are a single animal, when in practice, you mostly aren't.
> cope with all this complexity, both as individuals, and as a society, and survive.
Surviving is not thriving. Like roman construction, we just have very big error margings and margin of safety. Things do not have to work perfectly to finction
Also at a natural (non-man made) level, the complexity of biochemistry and the need to get 30 trillion or so cells working together as a single animal, in the presence of another 30 trillion or so single-celled organisms of random species, doesn't really seem like something that's going to succeed.