How has brian envolved fro chapter 1 to the epilogue?

He has evolved because he when he first went on the plain he didn't know how to survive in the wild. When the end of the book came he knew how to take car of him self and he knew how to start fire, build a home area and he was able to protect him self from the wild life.

answer; i believe that the correct answer is (c) ///

answer; researchers typically cannot control people's sexual behaviors as would be necessary in an experiment;