Evolution is the well documented fact that a population changes over time. (ie. Mutation of bacteria to become resistant to antibiotics) The Theory of Evolution by Natural Selection, is the...
It is considered a theory because it is substantiated by evidence. In the scientific sense, a theory is a proposition that is supported by evidence, either direct or indirect. With out some of...
Darwin was by no means the first person to come up with a theory of evolution. However, he was the first person provide a mechanism by which evolution could occur. He called this natural selection...
They both attempted to explain the same phenomena by natural means. Both theories also used inheritence of parental characteristics to explain how species might evolve.