All of it comes from the water. Everything, at the start. Didn't Darwin suggest as much? That life itself came from the ocean, in some roundabout way? Well, if not him, then his followers and subsequent researchers have certainly posited it, and with great vigor.
Life and death.
Our mother and grave, and the only thing between us is the shore.
Cherie Priest's Maplecroft, The Borden Dispatches.