What do scientists believe is the determining factor that causes skin color variations in groups of humans around the world?

Write a short paragraph of about 150-300 words. explain how the physical environment can limit human activities.

What could the united states of america do to improve their status? name at least 3(ap human geography)

Compared with the land in the highlands, the lowlands region of england a) rockier and more difficult for farmingb) the center of business and industryc)richer in coal reservesd)covered by more fertile farmland d) covered by more fertile farmland