born to run

(1) many animals are excellent runners, but there is one creature that surpasses them all in running long distances—the human being. (2) many scientists have studied this subject and discovered several reasons for it. (3) sweating humans regulate their body temperatures, especially when heated during running. (4) in contrast, other animals have to pant or simply stop running if they get hot. (5) one reason that humans run better is because of the numerous glands that enable them to sweat. (6) the fur on other mammals can also prevent their bodies from cooling.

in this passage, which sentence is in the wrong order?
a. sentence 4
b. sentence 2
c. sentence 1
d. sentence 5