I think its to late to answer this
The crusades for a series of religious wars initiated, supported, and sometimes directed by the Latin church in the medival period. The best known of these crusades add those to the holy land in the period between 1095 and 1291 that were intended to recover Jerusalem and surrounding area from the Islamic rule.
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Answer: Visible light spectrum.
Explanation: On the entire electromagnetic spectrum, the human eye can only detect and view the visible light spectrum which is what we, as humans, can separate into “rainbow-like colors.”