Question

why do most people in the sahara tend to live along the nile river or the mediterranean coast?
a. because of the lack of available water resources in the region
b. because most of the regions population works in the mining industry
c. because the thick vegetation in the inland areas of the region limits development
d. because there is no way to conduct trade in the region except via waterways

Explanation:

The Sahara is a vast desert with very limited water resources. Water is essential for human survival, agriculture, and daily life. The Nile River provides a reliable source of water for drinking, irrigation, and other uses. The Mediterranean coast also has access to water (from the sea for some aspects like fishing - related livelihoods and also some coastal water sources). Option B is incorrect as mining is not the main reason for population concentration there. Option C is wrong because the Sahara is mostly desert with sparse vegetation. Option D is inaccurate as there are other trade routes (though waterways are important but not the only way).

Answer:

A. because of the lack of available water resources in the region