Oxygen.
Oxygen.
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This reminds me of the Deathworlders series.
Is that the one where humans are consensually employed by all the comparatively more advanced alien species of our galaxy as their warriors or executives because even our weakest human is significantly more powerful to any of the nearest alien due to the nature of us all having been evolved from an ancient ape species that were prone to violence?
https://deathworlders.com/ - Dunno if it goes into that detail of us evolving from violent apes, but at least from chapter zero, seems to be mostly due to us being from a "high gravity" world and having "builtin combat drugs" (adrenalin)
Considering the amount of things that can kill us, both micro and macro, and the fact that we ingest poison (alcohol, drugs and even actual frog poison) for fun, it's pretty easy for any alien life to look at us and think "holy shit, those creatures are fucking hardcore!"
I second the recommendation, it's a great story. The writing isn't perfect, but it's absorbing and there's plenty of good world building and characters.
There's another series like that, the Human Chronicles Saga by T.R. Harris. Humans are super strong because the gravity on Earth is much higher than on other planets. Materials on the other planets are weaker too, simply because they don't need to be as strong, so the humans can break through walls easily.
So we’re like smart Klingons to them? Sweet.