That the egyptians used a calendar, illustrates that the egyptians made great advances in what field?

Advances in Astronomy

Explanation:

The Egyptians using a calendar, illustrates that the Egyptians made great advances in astronomy.

If you put this answer at when you submit the Practice, the "Possible Answer" is Astronomy

If you take Edginuity too,

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the communist manifesto is an 1848 political pamphlet by the german near the end of the manifesto, the authors call for a "forcible overthrow of all existing social conditions",  ..

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