*Massive face palm* Ow! You see what you did? You made me hurt my self.

Evolution is decent with modification (This is the fact of evolution, it has been observed), the theory of evolution is modification and natural selection, natural selection the proses where traits that increase an organisms chances of survival and passing on its genes build up in a populations and traits that decrease and organisms chances of survival and and passing on its genes are weeded out.
Adaptation is evolution.

Further reading
What evolution is and is not.
Mutation, natural selection and genetic drift
© 2009 all rights reserved