AES Academy

After a 1000yrs of war, humans went extinct. Leaving animals, "without a leash".

Without humans, we went into a new ecosystem. During the war, humans had released chemicals into the atmosphere. After they were gone, it lingered there. Though, it was contaminated enough a normal human would be dead just by breathing it in.

So . . . what about us animals?
Well, thats the werid part.
Our ancestors managed to adapt and breath it in properly and still function a normal life.
Though it had a side effect.
It had managed to change our DNA. . .

Leaving us to evolve.