In Crumb's versionyou can see how God creates light on the first day, water and the heavens on the second day, dry land and plants on the third, then finally gets around to creating the sun on the fourth day. Since a day is the time it takes the Earth to travel around the sun, the first three days in Genesis weren't "days" in the 24 hour sense. This is a critical thinking sticking point for literalists wishing to teach creationism in science classes.
Crumb also includes both versions of the creation of humans. In the first chapter, God seems to create both Adam and Eve at the same time. In the second chapter, God forms man out of dirt, then has Adam meet and name all the animals in the garden. After finding no fitting helper, God casts a deep sleep on Adam, removes his rib, and magically transforms the rib into Eve. While the story is as interesting as any other creation myth, it won't do much to advance science or Christianity if required reading in biology classes.