Is the nitrate level high or low? what are the possible sources of nitrate upstream?

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

Describe how ocean currents can affect a moving object ❕❕❕

Given: circle a externally tangent to circle b. how many possible common tangents to circles a and b can exist? 2 3 4