I can't figure out the right answers. They are all way to similar.

What is the main source of phosphorus?

Punta arenas is the southernmost point of which country

What characteristic of the basin that feeds the congo river system affects movement in central africa? a. the center of the basin is a dense rain forest. b. it is the center of ethnic conflict in the area. c. wildlife on the savanna makes it too dangerous to travel. d. the basin is surrounded by desert.