I beat relentlessly, marking life and death, yet I am often taken for granted. What am I?

Category: Science · Difficulty: expert

Hint: Think about the internal cycles of living beings.

Answer

A biological rhythm

Explanation

A biological rhythm refers to the natural cycles that govern physiological processes in living organisms, such as sleep and metabolism.

This is a expert science riddle — one of the harder riddles here. The answer is A biological rhythm.

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