What they don't do in as much detail is, they don't ask what were conditions on early Earth like before life? (sciencedaily.com)
Cells formed from four basic ingredients... methane, ammonia, hydrogen and water... all of which were in abundance in early earth history. (religion.blogs.cnn.com)
At some point in early earth history, the entire globe was covered by water. (religion.blogs.cnn.com)