1) why is malaria so common in africa south of the sahara? a)the principal malaria transmitting mosquito – anopheles – is common there. b) lack of resources and political instability prevent the building of adequate prevention programs. c) malaria parasites are increasingly resistant to antimalarial drugs. d) all of the above. 2) victoria falls is located at the base of which of the following rivers? a) nile river b) niger river c) congo river d) zambezi river