Well, then anything adaptive is "reincarnation." You might as well just call it "adaptation," then, instead of redefining another word.

Thats it, i normally dont say "reincarnation". It seems to me that words like that were used to make graspable a concept thats hard to grasp; but it lost its sense when someboy tried to hard to make it fit in some view of things.

Edit: It can also be called Evolution.