Comparison of even-toed ungulate and cetaceans genetic material has shown that the closest living relatives of whales and hippopotamuses is the paraphyletic group Artiodactyla. Dan Graur and Desmond Higgins were among the first to come to this conclusion, and included a paper published in 1994.
Definition of roundâtrip. : a trip to a place and back usually over the same route.
Journey (n.) One piece of travel (going from one place to another) â usually a long distance. The journey takes 3 hours by plane or 28 hours by bus. He made the 200-mile journey by bike. âA journey of a thousand miles must begin with a single stepâ â Lao-tze, Tao Te Ching.