Evolutionary theory has many problems, but none bigger than how life began. That is such a problem that that subject has been split away from evolutionary topics and the assumption is for the evolutionary theory is that life did somehow accidently start.
Those who support evolution will offer up sort of simplified ideas for how life began, but those Biologist and Chemist who are studing this very complicated issue have yet to come up with a theory that they can agree to. The very detailed and comprehensive science they know so far has kept them from getting to first base.
There is an answer, THERE IS A CREATOR.