Scientists discover the earth's earliest animal with an astonishingly complex body structure

The ctenophore is the earliest animal on Earth. According to today's US Life Science website report, a new discovery by Brown University in the United States shows that the first animal on Earth found by scientists is the marine floating ctenophore, not the simple sponge. This discovery has greatly shocked the scientists, and they did not expect that the earliest animal on Earth would be so complex.