Which reason best explains why areas of south asia with arid climates aren't densely populated?
a. the arid climates contribute to low air quality from pollution.

b. cities located in arid climates are negatively affected by floods from nearby rivers.

c. monsoon rainfall produced in arid climates destroys settlements.

d. the arid climates cannot support farming

Which were the most important issues during the presidential election of 2008? economic downturn and environmental protection two overseas wars and economic downturn two overseas wars and campaign spending environmental protection and campaign spending

Which factor was a major cause of the great depression of the 1930?

The rise of advertising in the 1920s. i am good with seeing how advertisements shape the roaring twenties and how it developed a new way of life through modern days. but i am not sure what the details of advertising in the 1920s were. if possible can you send me links (preferrably credential links) to sources that maybe show like the first company to start advertising through the radio, how advertising benefits (statistics graphs), etc.