B. Pax Mongolica. In Pax Mongolica, there is relative peace that happened after Kublai Khan was killed. Resulting to this, the re-opening of Silk Road gave way to transfer to culture, tradition, and trades, and religion.
D. It was the first program to send a human to the moon. Project Gemini was chartered by President John F. Kennedy and NASA's second program in human spaceflight program. Project Gemini's goal is to make space travel techniques for the Apollo mission that would later begin.
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