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IMSO 2019 Science International - Theory I Question 11

IMSO Science · IMSO 2019 Science International - Theory I

Question 11

A residential area discharges untreated sewage into a lake. The pollution causes which change?
  1. Decrease in carbon dioxide concentration
  2. Decrease in dissolved nitrate concentration
  3. Decrease in number of bacteria
  4. Decrease in oxygen concentration