How has the population in ghana changed from how it was thousands of years ago? it decreased because the ancient africans used up northern africa's resources. it decreased because less rainfall caused northern africa to become a desert. it increased because farming methods improved and irrigation was introduced. it increased because the diseases that killed early africans became treatable.

How did the russian revolution impact world war i? a) the russians required the allied powers to come to their aid and defeat the radical groups. b) the russians pulled out from the war, enabling the germans to focus on the western front. c) the russians created new technological advancements that were used by the allied powers to win. d) the russians created a new communist government that aligned with the central powers instead.