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Biological clock
"Biological clock" in a Sentence (3 examples)
2005 US Department of Health - Your guide to healthy sleep Your biological clock is actually a tiny bundle of cells in your brain that responds to light signals received through your eyes.
Her biological clock is ticking.
Take Linda, a thirty-nine-year-old newscaster who relished her career but began to hear the alarm ringing on her biological clock.
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