Biology 5090 · O Level · Effects of humans on ecosystems

Effects of humans on ecosystems — practice question

During the last few years, many major rivers in different regions of the world have become more acidic. What has led to this change?

  • Aair pollution by sulfur dioxide
  • Bdeforestation
  • Cincreased use of insecticides
  • Dincreased use of nitrate fertilisers

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