Barrow Alaska is an example of a polar tundra climate that is marked by low vegetation growth, cold temperatures, low amounts of precipitation, and no true summer.
B; As far as the relation between humans and the environment, it is obvious how much they relied on it. Not only as a food source, but for economic growth and sustainability as well. The other answers make valid points but in the context of this question, the only one that even mentions the relation is B.
