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biological clock

n.
1.an innate mechanism in living organisms that controls the periodicity of many physiological functions

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    Idiom of the Day

    take a spill
    to fall, to tip over
    The little boy took a spill when he was learning how to ride his bicycle.



    1.
    Although it was so ridiculous that no one believed it to be true, the reporter’s ________ still cost the governor his re-election.

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