Question 41-44 are based on the following passage. 

   Today's pet dog descended from wolves wild animals that shared the same habitat as human hunter-gatherers and, eventually, became domesticated companions at about 7.000 BC. There are a few theories that explain the change from savage creature to complimentary intimate. One hypothesis suggests that when humans took in abandoned wolf cubs, inbreeding and a new generation of domesticated animals followed. Another theory posits that scavenging wolves would find carrion that had been discarded by humans. which lead them to approach the unfamiliar beings. As they got nearer they fought their instinct to flee, and that trait was passed along to their descendants, making them more suited for domestication.

    Along with the domestication of wolves came physical changes to the tame canine such as a smaller build, a more compact jaw along with diminutive teeth as compared to their feral counterparts, alterations in fur coloring and markings; a smaller brain and subsequently a decrease in cranial capacity which did not allow room for certain instincts that are essential in the wild.

    In an attempt to recreate the domestication of these mammals, Dmitry Belyaev commissioned an experiment with wild silver foxes that were discerningly bred over tour decades and displayed amiability towards humans that they previously had not possessed. 

Which of the following best describes the organization of the first paragraph?