Final answer:
Prefixes in medical terms alter meanings and are positioned at the beginning of words. Not all medical words require prefixes, and they can include single-letter prefixes like 'a-' or 'p-'.
Explanation:
Prefixes in medical terms are important word parts that are located at the beginning of a medical term. They alter the meaning of the medical term. Not all medical words must have prefixes; some medical terms consist only of a root word and a suffix. Prefixes can indeed be single letters, such as "a-" or "p-" in terms like "asymptomatic" or "postoperative."
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