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.
U.S. daily travel averages 11 billion miles a day â almost 40 miles per person per day; How Many Trips We Take in a Year. Americans take 411 billion daily trips a year or about 1,500 trips per person; U.S. daily travel totals about 4 trillion miles â 14,500 miles per person; Why We Travel. 45 percent of daily trips are taken for shopping and errands