I'm feeling particularly cranky this morning, so forgive my crude language.
But do you honestly think scientists care whether you can see or not see how the process worked?
Others may try to put this in layman's term for you, but let me be blunt. Evolutionary biology takes a life time to study. If you're interested in the subject, then go take some classes. In the mean time, don't expect us to teach you evolutionary biology in a few posts on an online internet forum.
You seem like someone who's at least taken algebra in school, correct? Can you imagine teaching someone algebra in a couple online forum posts?
Added by edit.
You have 2 choices here. Either go to school and actually learn something or go to bible school and learn the goddunit answer for everything. Enough said.
Edited by Taz, : No reason given.