I love your tagline. And yet you would seem to think the first acorn tree came from an acorn and not the other way around. The basic argument of evolution is what occurs first the cause or effect. Take away the Bible for a minute.
Do things begin with a mature plant that produces seeds or do things begin with seeds that eventually produce a mature plant. I submit it makes common sense to start with a mature plant which produces seeds. Otherwise an effect occurs without a cause. Everything that we see has an origin. Where does the first amoeba come from? It has to have an origin.
No, not necessary, thats a unknown. However if you think everything can be explained faith and belief in the unknown what is the origin of God.