From an evolution stand point, was it cooperation or competition that's made humans the dominant species ?

Yes.

That and the opposable thumb.

This question looks very familiar. But I’m sure you’re much more serious…

Competitive cooperation between their manual digits, has given humans the ability to use tools to make fools of all other species.

I saw a documentary about cooperation between chimps. Scientists set up tests where the only way they could get a reward was to cooperate….and they did.