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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

    tell (someone) where to get off
    to scold someone, to express one's anger to someone
    I told the man where to get off when he complained about us for no reason.



    1.
    He finished ________ in the race.

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