Which of the following was NOT used as a source of power by medieval farmers?

Name: Which of the following was NOT used as a source of power by medieval farmers?
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Question

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Coal was not used as a source of power by medieval farmers. Coal did not become a widely used fuel source until the Industrial Revolution in the 18th century. Medieval farmers relied on horses for transportation and plowing, and water was used for irrigation and powering mills.

Which of the Following Was NOT Used as a Source