A few cities of the Sahel were built A. at oases

B. in marshlands

C. on sand dunes

D. in the Sahara

Based on this map, which statement about africa’s economic activity is most accurate? a) coastal countries are all members of opec b) economic development is more common with opec nations c) coastal countries have more access to productive resources d) economic development is more common above the sahara desert

Solve for r in the formula v = ir, when i = 5 and v = 15.

What is the amount of organic matter in all living organisms in a habitat called?