What physical feature most likely influenced the early settlement of the major population centers of egypt?
a) lake nasser
b) the red sea
c) the nile river
d) the gulf of suez

The answer is C. Most of its population, up to the present times, live near the riverbanks of Nile river. During ancient times, early tribal people migrated near the Nile river wherein they established agricultural economy and a society.  The Nile river also was their source of living during those times.

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:

I’m sorry i don’t know the answer