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.
This section focuses on daily passenger travel. Results from the 2001 NHTS show that daily travel in the United States totaled about 4 trillion miles (table 2, table A-8), an average of 14,500 miles per person per year.On a daily basis, the average person traveled 40 miles, most of it (35 miles) in a personal vehicle.Because more than one person can travel in a personal vehicle, these 35 person miles amounted to about 23 vehicle miles traveled. Annually, the total number of vehicle miles traveled in 2001 was nearly 2.3 trillion.his section focuses on daily passenger travel. Results from the 2001 NHTS show that daily travel in the United States totaled about 4 trillion miles (table 2, table A-8), an average of 14,500 miles per person per year.