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  1. T

    Chemistry question

    I know that phosphoras is one of the substances that are used in fertiliser but my question is can calcium carbonate Ca3(PO4)2 be a fertiliser? I know it is insoluble in water, therfore it is supposed not to be fertiliser. right?
  2. T

    Human Biology 7042--January 2010 Mank Scheme needed

    Please could someone give the Mark Scheme for the January 2010 session for both pappers 1 & 2. Thanks!!!
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