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.
However, booking a round trip flight can be a simpler process. You can compare round trip and one way flights by using our flight comparison. The average price for one way flights from New York to Mexico City is $272. The average price for round trip flights from New York to Mexico City is $508.