Evolutionary biologists typically exclude histones from consideration, because those times do not confirm preconceived ideas about what the Precambrian tree of life ought to look like. But that raises obvious questions. If we don’t have fossils documenting a common animal ancestor, and if genetic studies produce such different and contradictory divergence times, how do we know what the tree of life should look like and when the first animals began to diverge from a common ancestor?
Good questio
