本题目来源于试卷: SL/HL Topic D4.2 Stability and change，类别为 IB生物学
[单选题]
4. Why does leaching of nitrogen and phosphate fertilisers lh w3apk y0n53 oc;)7 bl+7tps3uyxkqread:p7wz9sci h hz+2i*yx *4ge ws to an increase the Biochemical Oxygen Demand (BOD) of local freshwati 4+hy7:wi9*z wzs2g cex*hs per ecosystems (lakes and rivers)?
A. It increases the rate of photosynthesis of producers.
B. It decreases the population of producers.
C. It increases the population of saprotrophs.
D. It deceases the fish populations.
参考答案: C
本题详细解析:
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