A You tube video of the complexity involved in epigenetic adaptational controls which can lead to inheritable changes. This removes a major tenet of Darwinism that evolution is entirely at random and a chance mechanism that never implies purpose. Organisms can adapt and it may be purposeful most of the time. However, chance mutations do occur and must have some effect although most chance mutationsd have been found to be deleterious:-http://www.youtube.com/watch?feature=player_detailpage&v=52d5jWK1vdc-Science progress seems to be on God's side.