Are you trolling, or have you actually never taken a science class? If you want to ask a tough question, it should be about abiogenesis, since the evolution from amoebas to complex multicellular life is comparatively straightforward. The reality is that any scientist will tell you that no one knows, because that is the intellectually honest answer.
It is self-evident to me that, just as something cannot come from nothing, life cannot come from non-life. God is Life, among His countless attributes.
Science is good at connecting the dots within creation, but scientists run into profundities when attempting to explain origins and ends.
Jesus said "I am the Alpha and the Omega". That is a metaphysical statement, not analyzable by the scientific method. But it says a lot for me! Only God truely creates and only God destroys.