But what about before that?

I think this is it exactly. Organisms evolve in a general sense in response to changes in the environment. The environment of humans is no longer changing in that way - we're no longer at the mercy of the environment, we simply adapt the environment to suit us (eg. wearing clothes, agriculture, making weapons to detract predators).------------------
o--greyline--o[This message has been edited by greyline, 03-20-2003]