You cant settle in deserts due to lack of water and scarcity of food, which led to the Saharan regions being less populated. Hope this helps.
Do you have a table? Or options to go with the question?
The answer is b. Constitutional monarchy. I know this because all of the other ones are examples of other types of governments. This is the only one that is a true cross between the two
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I think it is rivers because you can't drink out of the ocean and lakes are nasty aquifers are usually smaller so rivers would be most likely
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