May/June 2026 Paper 23

2026 · 40 questions · 40 parts · 40 marks

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38Human Impacts EnvironmentMedium1 mark
When a river is polluted by fertiliser, the following processes may occur.
  1. 1
    increased aerobic respiration of decomposers
  2. 2
    increased growth of producers
  3. 3
    decreased oxygen concentration in the water
What is the correct sequence for these processes?