Are Fish Deuterostomes?
Fish are among the most diverse and abundant life forms on Earth. They inhabit almost every aquatic habitat, from the deepest oceans to the shallowest streams. Fish have been around for hundreds of millions of years, and their evolution has produced a wide variety of species, shapes, and sizes. But, are fish deuterostomes? The answer is yes. Most fish are deuterostomes, meaning they have a two-stage embryonic development. In the early stage of development, the embryo is encased in a two-layered shell....