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

#1 is A. The mosquito carries it.
#2 is d. Zambezi River
I am about to get out of school or I would explain both but I hope this helps! :)

The investiture controversy began as a power struggle between pope gregory vii (1072–85) and henry iv, holy roman emperor (1056–1106).[2] a brief but significant struggle over investiture also occurred between henry i of england and pope paschal ii in the years 1103 to 1107, and the issue played a minor role in the struggles between church and state in france, as well.by undercutting the imperial power established by the salian emperors, the controversy led to nearly 50 years of civil war in germany, and the triumph of the great dukes and abbots. imperial power was finally re-established under the hohenstaufen dynasty. historian norman cantor: