intelligence without brain

It is able to sense gravity, light, presence of other mushrooms. It is able to make these complex decisions about when and where to form a mushroom. And how does it do that?
Right? There is no brain. There is no nervous system. It's just sort of that amorphous collection of like white fuzz inside the wood or inside the soil.
And it amazes me that mushroom and fungi in general have this capacity to sense their environment.

It is even crazier.

How is it able to do all this without a brain? nor even more than one cell..

It can even exchange knowledge by fusionising

So where does alive life and intelligence even come from?
From dead material? Some illusion of feeling alive and concious but only dead electricity in your brain?

..But without a brain?
And what if galaxies are not hold together by some dead gravity but alive plasma ?

Plasmaverse