One of the tenets of Darwin's theory is the survival of the fittest, ie adaptation of features that allow a species to adapt better to its surrounding environment. I am wondering that given the right conditions, is there a possibility of a more "complex" species, say humans, back-evolving into a less "complex" species, say a dog? Is there anything in Darwin's theory or some experimental proof that excludes such a possibility?
EDIT (4/19/12): Thanks for all the responses! I definitely agree with the fact that we are no more complex than dogs or Drosophila, hence the quotes surrounding complex in the question. I learnt a lot from the answers and don't think there is any one answer that is the best, but read together, they drive home the point. Thanks all!
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