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nitrification

n.
1.the chemical process in which a nitro group is added to an organic compound (or substituted for another group in an organic compound)
2.the oxidation of ammonium compounds in dead organic material into nitrates and nitrites by soil bacteria (making nitrogen available to plants)

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    Idiom of the Day

    send (someone) about his or her business
    to send someone away (in an unfriendly manner)
    I sent the man about his business when he interrupted my work last evening.



    1.
    The past participle of 'go'is ________

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