Pretty easy if one accepts it as being a literal and historical account of what actually happened!I read about a Bible scholar who studied Genesis for 50 years and could not come to any satisfying conclusions about it.
So, my theory or idea is that God created heaven and earth and LIFE. Now I do believe adaptation and evolution took place after that.
Man's free will has a lot to do with my theory - but I do wish God hadn't created "pestilence" that I see in Exodus. These have adapted biologically and evolved into animal kingdom predators that we have to control all over the world.