Millstones
Millstones or mill stones are stones used in gristmills, for grinding wheat or other grains.
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Answer: C
Explanation: Slaves weren't taught or allowed to learn much so they learned by stealing a book for example and reading it on their free time.
The answer is A: The development of the first mathematical system of perspective
Answer:
Fraternity
Explanation: It's b) Fraternity because people are always together and are always helping. So by my point of view its Fraternity.
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