Imagine a very fast, very deep, very wide river. Tiny shore fish live in shallow water along the banks of the river. But they do not go across the river. The middle is too deep, too fast, and full of dangerous predators.What would you expect to find if you looked at shore fish on one side of the river, and compared them to shore fish on the opposite bank?*Note: assume "shore fish" are all of the same biological species.Group of answer choicesPopulations of shore fish on opposite sides of the river would be genetically different.Populations of shore fish on opposite sides of the river would be genetically identical to each other.