The population pyramid shown represents a community that has been affected by human migration. A. Explain ONE economic reason why people under the age of 50 are unlikely to migrate to this community.

B. Describe ONE social pull factor that would draw migrants who are over age 65 over long distances to the location shown in the pyramid.

C. Explain ONE reason why the population for females aged over 80 can be a slightly larger group than the women aged 75 to 79 population.

D. Explain the degree to which the population pyramid shown can be used to predict local needs for social welfare services.

Several climate feedback loops to increase temperatures from the last glacial 20,000 years ago to interglacial conditions today. which of the below is a negative feedback loop rather than a positive feedback loop? a. warming temperatures and more rainfall globally at the end of the last glacial period caused increased growth of vegetation which would act to decrease atmospheric carbon dioxide levels. b. warming of the oceans at the end of the last glacial period releases carbon dioxide to the atmosphere (because less carbon dioxide can dissolve in warmer water). c. warming temperatures at the end of the last glacial period resulted in thawing of permafrost over large areas which released carbon dioxide to the atmosphere. d. warming temperatures at the end of the last glacial period caused a reduction in ice covered areas (sea ice, ice sheets and snow) which decreased the earth's albedo.