Definition of biological clock in English:

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biological clock

noun

An innate mechanism that controls the physiological activities of an organism which change on a daily, seasonal, yearly, or other regular cycle.
Example sentences
  • Yes, that's controlled by an internal biological clock.
  • At dusk, however, the insect is activated by an internal biological clock, which regulates most of its behaviors.
  • This helps set the internal biological clock that regulates your sleep and waking patterns.

For editors and proofreaders

Line breaks: bio|logic¦al clock

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