What is the best explanation for the population growth shown in the graph?
a.) cities provided better entertainment and cultural opportunities.
b.) cities were more sanitary and healthy environments than farms.
c.) an agricultural revolution meant there was more food available.
d.) better mining techniques increased the demand for coal.

Which reason best explains why certain areas of southwest asia have low population density? a. the semi-arid climate makes farming difficult because it produces very little rainfall.b. the moist climate limits job opportunities because it reduces oil production.c. the semi-arid climate produces heavy rainfall that contributes to devastating floods. d. the moist climate reduces agricultural production by causing water shortages.