How do these inventions and contributions from Abbas Ibn Firnas demonstrate that Cordoba was a center of learning and innovation?

no statements but ok.

the statement that best describes the idea of manifest destiny that was used in the 19th century would be that "it was fate that the united states would continue to  expand westward," since people thought the us was "destined" to do so. 

the answer is false.

b. ensure mutual protection from communism.

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