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http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w12_qp_12.pdf
12, 23, 33,34 and 39! pleeease explain
questions 33 and 34,Im a little confused. regarding quention 39 i think u know that nitrification is when the nitrites are changed to nitrates. so the answer is obviously C
12, 23, 33,34 and 39! pleeease explain
questions 33 and 34,Im a little confused. regarding quention 39 i think u know that nitrification is when the nitrites are changed to nitrates. so the answer is obviously C