Answer:
Among the earliest inventions were the abacus, the sundial, and the Kongming lantern. The Four Great Inventions,the compass, gunpowder, papermaking, and printing – were among the most important technological advances, only known to Europe by the end of the Middle Ages 1000 years later.
Explanation:
The answer is B, or Communications between the thirteen colonies that helped unite people against the British.
Explanation:
The Committees of Correspondence were Patriots.