I run continuously, though I’m not alive, ticking away, ensuring life can thrive. What am I?
Category: Science · Difficulty: hard
Hint: Consider the body's internal clock.
Answer
Circadian Rhythm
Explanation
Circadian rhythms are physical, mental, and behavioral changes that follow a daily cycle, responding primarily to light and darkness.
This is a hard science riddle — a tricky one that takes a little thought. The answer is Circadian Rhythm.
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