Final answer:
Returning crusaders did bring back scientific and medical knowledge from the Islamic world, which contributed to the European Renaissance and subsequent intellectual advancements.
Step-by-step explanation:
It is true that returning crusaders brought back scientific and medical knowledge from the Islamic world. During their encounters with the Islamic civilization, crusaders and other Europeans were exposed to advancements in various fields, such as medicine, mathematics, and astronomy, which had flourished in the Muslim world during Europe's medieval period.
Scholars like Al-Khwarizmi, the father of algebra, and Ibn Sina, an astronomer and physician, made significant contributions to their fields that eventually made their way to Europe. The transfer of this knowledge was aided by the Crusades, as well as by the migration of Byzantine scholars to Italy following the Ottoman conquest, who brought with them texts and knowledge preserved by Arab scholars.