Sorry, English isn`t my mother tongue, so at the moment I'm not able to explain you something like evolution.
By the way: I`m no professor - but I hope I will become this in about twenty years.
Darwin's Theory of Evolution is -as the name says - a theory. Nobody calls it perfect, nobody says, thaw we are able to refollow every step starting with the beginning of life. But at the moment we have no theory with more evidences. We have fossils. We have genetic similarities of different species all over the world. A few weeks ago I read an article about the evolution of the eye. Scientists analysed the eye of a species of small, nearly blind fishes and compared it with our eye. Much structures asre homologue but they have a complete different use.
The only point neither Darwin nor creationists can explain is the beginning of live. Maybe, chemistry will find the answer - or one possibility - one day, maybe not. We will see.