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What does the prefix "Hypo-" denote?

  1. Under, decreased

  2. Above, increased

  3. Normal, stable

  4. Rapid, fast

The correct answer is: Under, decreased

The prefix "Hypo-" generally means "under" and is commonly used in medical terminology to indicate a deficiency or a reduced amount of something. Option B, "above" would be the opposite and the prefix for this would be "Hyper-". Option C, "normal" does not indicate a difference or change in quantity or condition, while option D "rapid" or "fast" would be better represented by the prefix "Tachy-". Therefore, the most appropriate option is A, "under" or "decreased".