What is the structure of the passage?

Directions: Read the following passage and answer the question.
Some scholars believe that the Neanderthals died out at the hands of the more graceful, more intelligent and more numerous Homo sapiens. These scholars also seem to take an almost perverted pleasure in projecting the beetle browed Neanderthals as being oafish and dim witted, and go on to propose that the modern humans survived because of their superior mental prowess. However, recent research suggests that the Neanderthals had a brain size that rivaled modern humans, and were physically fitter too. Neanderthals are believed to have been present in Europe and in a large part of Eurasia while all of the Homo sapiens are believed to have evolved from ancestors that came mainly out of Central Africa. One does feel like saying Hail Hitler to all the racists, Ku Klux Klan members, and the assorted White supremacists at that. If populations of both these races were not very sizeable, as is a reason to believe, it leads one to the belief that it could not have been a struggle for resources or land that would have lead to a clash between them
Another theory contends that the Neanderthals were the victims of a rapid change in their environs. It is hypothesized that Europe was suddenly overrun with several volcanic eruptions and perhaps the earth also went through a gelid period and both these reasons combined with other reasons to cause the obliteration of the Neanderthals. The theory contends that the erstwhile denizens were caught off guard and that even though they were quite accustomed to the extremely cold environs of the continent at that time, the magnitude and the sheer scale of the metamorphosis was too extreme to handle. Neanderthals were also let down by their societal makeup. All members of the society were involved in hunting big and mid sized game, and that activity resulted in a lot of falls and breaks. As there was no division of labor that could have resulted in women and children trapping small game and otherwise be engaged in innocuous pursuits, there was no insulation for their children or for the procreators of the race and that in itself played a preeminent part in the untimely demise of the race. There is always a serpent in paradise and even this explanation has unsurprisingly found its fair share of detractors. The naysayer tribe points to the fact that there is no credible evidence that there was a spurt in volcanic activity concomitantly in the region that the Neanderthals were supposed to have originated from and mostly lived and hunted in.