1. The North had a bigger population.
2. The South had a better military advantage.
Advertising a product changed from simply announcing the existence of a product in a dull, dry fashion to persuading the public they needed and deserved to own the product. By developing repeat customers, advertising also helped build brand loyalty for the company.
The answer is b) flat plains. Egypt is a desert where as Mesopotamia is flat mud plains, so they are not similar there.
A. Rejoiced! Hope this helps :-)