I know that will come up, but i already know what causes the depression, the q is why we have the abiliity to become depressed, They say happiness is the healthiest way to live, and natural selection is what allows us to adapt for the better, So to our life what are some benefits that involve depression??
Depression can be as bad as cause someone to kill himself, that is definately not good for evolution. Then Why depression exists???
I know why, but this is not metaphysics category , so i can't discuss it here