"Together, this combination of parallel character and contrasting profile point to the different origin of materials in Genesis 1 and Genesis 2, however elegantly they have now been combined." The primary accounts in each chapter are joined by a literary bridge at , "These are the generations of the heavens and of the earth when they were created." This echoes the first line of Genesis 1, "In the beginning God created the heaven and the earth", and is reversed in the next phrase, "...in the day that the God made the earth and the heavens". This verse is one of ten "generations" ( ) phrases used throughout Genesis, which provide a literary structure to the book. They normally function as headings to what comes after, but the position of this, the first of the series, has been the subject of much debate. Mesopotamian influence Comparative mythology provides historical and cross-cultural perspectives for Jewish mythology. Both sources behind the Genesis creation narrative borrowed themes from Mesopotamian mythology, but adapted them to their belief in one God, establishing a monotheistic creation in opposition to the polytheistic creation myth of ancient Israel's neighbors. as a whole is imbued with Mesopotamian myths. Genesis 1 bears both striking differences from and striking similarities to Babylon's national creation myth, the Enuma Elish. On the side of similarities, both begin from a stage of chaotic waters before anything is created, in both a fixed dome-shaped "firmament" divides these waters from the habitable Earth, and both conclude with the creation of a human called "man" and the building of a temple for the god (in Genesis 1, this temple is the entire cosmos). On the side of contrasts, Genesis 1 is monotheistic; it makes no attempt to account for the origins of God, and there is no trace of the resistance to the reduction of chaos to order (Greek: theomachy, lit. "God-fighting"), all of which mark the Mesopotamian creation accounts. Still, Genesis 1 bears similarities to the Baal Cycle of Israel's neighbor, Ugarit. The Enuma Elish has also left traces on Genesis 2. Both begin with a series of statements of what did not exist at the moment when creation began; the Enuma Elish has a spring (in the sea) as the point where creation begins, paralleling the spring (on the land – Genesis 2 is notable for being a "dry" creation story) in that "watered the whole