Quote:
Originally Posted by
DrB0b
Why do you think it's unlikely that a mammals could have evolved from bacteria - what's the reasoning behind your stance?
Two reasons: One is the evolution of consciousness in higher mammals cannot be explained (Sabang has covered this, so I won't comment further). Another problem with evolution is the concept of irreducible complexity, expressed by writers such as Michael Behe and William Dembski. Certain biological systems (e.g. ocular, endocrine cardiovascular) can only be reduced so much in their complexity, then they cease to function, i.e. it is very difficult to see how they evolved incrementally. I'll try an analogy: New York City developed incrementally, probably starting with a few Indian huts. So, the city evolved very gradually into what it is today. It can be reduced in complexity to the huts, so in a sense 'evolution' did occur, brick by brick. Now, take the Brooklyn Bridge. Until it is totally complete, it is dysfunctional, nothing can cross it until the last few feet were finished. It's complexity cannot be reduced any further than it's complete span. This is irreducible complexity. Michael Behe mentions bacterial flagellum as something that cannot function at all unless a number of complex parts are in place (as with the Brooklyn Bridge). It is very difficult to imagine how certain biological systems can evolve through mutations when they are so complex. They would fall off the map, so to speak, when only partially evolved, because they would be totally dysfunctional. You mentioned how an eyeball could have evolved from a light-sensitive patch, but evolutionsists seem very tentative when trying to explain the evolution of complex systems within the body.