For free thinkers, not religious zealots.... Theory of Evolution question?

If you are truly seeking answers, allow me to suggest you find a copy of the book 'There is a River' by Thomas Sugrue. You will very likely end up with answers to questions you haven't yet considered. Good luck. I don't know anything for a fact, but in fact I do know what I believe. However, just because I believe it, doesn't make it true. I don't think most of us (humans) are intelligent enough to know anything for an absolute, incontrovertible truth, but, through diligent study, we can at least know what we believe.