what does this mean? is there an image?
To set an example of how back in the early 1700s and 1800s how they were ruined by the government and used mills to get fresh milk and water with ought the government providing anything useful
The answer is D) rhythm.
During the Ars Antiqua, music theory made great strides. One of the most important innovations from this time was the devlopment of a notation, or written representation in sheet music, of rhythm. Rhythm is naturally a very important element of music, and being able to represent the rhythm of a song in written form made it much easier to play it accurately without having heard it.
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Probably music or some sort of fashion related art