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.
Although the standard mileage award for a domestic economy ticket on most airlines requires 25,000 miles, making each mile's value a paltry 1 cent, airlines sometimes require up to 60,000 miles roundtrip for the same trip, reducing the value to less than one-half cent.or example, one of the worst ways to spend miles is to buy an economy class ticket on a flight between New York and Los Angeles, which typically costs around $300 round-trip in tax, and sometimes goes as low as $219.