The Red Queen hypothesis for sex is simple: Sex is needed to fight disease. Diseases specialize in breaking into cells, either to eat them, as fungi and bacteria do, or, like viruses, to subvert their genetic machinery for the purpose of making new viruses. To do that they use protein molecules that bind to other molecules on cell surfaces. The arms races between parasites and their hosts are all about these binding proteins. Parasites invent new keys; hosts change the locks. For if one lock is common in one generation, the key that fits it will spread like wildfire. So you can be sure that it is the very lock not to have a few generations later. According to the Red Queen hypothesis, sexual reproduction persists because it enables host species to evolve new genetic defenses against parasites that attempt to live off them.
The function of an argumentative essay is to show that your assertion (opinion, theory, hypothesis) about some phenomenon or phenomena is correct or more truthful than others'. The art of argumentation is not an easy skill to acquire. Many people might think that if one simply has an opinion, one can argue it successfully, and these folks are always surprised when others don't agree with them because their logic seems so correct. Argumentative writing is the act of forming reasons, making inductions, drawing conclusions, and applying them to the case in discussion; the operation of inferring propositions, not known or admitted as true, from facts or principles known, admitted, or proved to be true. It clearly explains the process of your reasoning from the known or assumed to the unknown. Without doing this you do not have an argument, you have only an assertion, an essay that is just your unsubstantiated opinion.
So, the theory goes, the Solutreans paddled from Ice Age Europe in kayaks perhaps as early as 18,000 BCE using methods similar to those of modern Inuits – camping on ice floes, drinking water from icebergs, and burning blubber for heat. The Solutrean toolkit, which included sewing needles and fish hooks, certainly could have been used to make waterproof clothing and watercraft from animal skins. Eventually the American descendents of Solutrean immigrants met up with the people who crossed from Beringia, and the Clovis technology was born. But as with the coastal route theory of Beringia migration, the difference in modern sea levels prevents a direct search for archaeological evidence. However, evidence of an entirely different kind, from the study of genetic origins, has added interest in the Solutrean Hypothesis.