2. Humans have adapted to the cold in numerous ways. The first of these is shivering, which is a short-term response that the body uses to temporarily heat itself up. Another way the human body adapts to the cold is by increasing the amount of fat that insulates the important bodily organ, which reduces heat loss and maintains the body temperature; this is an example of a facultative adaptation. In addition to these two methods, the human body heats itself genetically through the use of developmental adaptions, specifically ones that change the body shape so that it is compact and round enough to retain heat. Finally, the body uses cultural adaptions, such as wearing clothing that is suitable for the frigid temperatures, as a means of staying warm.
4. Race has very little to do with the short term response addressed in #2 because people of all races shiver when they are cold in order to heat their bodies. However, one could affiliate certain races with more fat covering their vital organs, which would associate that race with the facultative adaption I addressed. The same can be said for the developmental trait, as one could suggest that a specific race is more likely to be rounder and more compact than others (again, not necessarily true but it can be used to understand the types of people who are more likely to thrive in cold weather). Finally, the clothing worn by individuals can tell a lot about their culture as well as the climate, so heavier clothing on a group of people would suggest success in cold weather. Of course, none of these relationships to race are as legitimate as linking these adaptations to traits that are common amongst any individual in these environments. The fact is that a person of any race can survive in freezing climates so long as they possess the traits that are required to survive; this is why race is an inferior method of understanding human variation.