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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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Word of the Day

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    Idiom of the Day

    rant and rave about (someone or something)
    to shout angrily and wildly about someone or something
    The man was ranting and raving about the bad service at the restaurant.



    1.
    All the reporters of the war were issued ________ bulletproof jackets to give them better protection.

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