An Islamic city that became a great cultural and scientific center in which mosques, schools, libraries, and even universities were established and cohorts of scholars emerged from it. Which is it?

It was Timbuktu.

Explanation:

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation:

eleanor roosevelt

his husband tremodulny   by adding propserity and being serious about thingds aswell such as with the new deal one of the best first ladies out there was eleanor