I can indicate life yet remain unseen. I fluctuate continuously but can be measured accurately. What am I?
Category: Science · Difficulty: medium
Hint: Think about how we gauge vitality.
Answer
A heart rate
Explanation
A heart rate reflects the number of beats per minute, indicating health status, while the other options measure different physiological functions.
This is a medium science riddle — a moderate challenge for most people. The answer is A heart rate.
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