Options :
  1. is a normal process that converts dry land into marshes
  2. is slowed by the presence of phosphate and nitrate fertilizers
  3. is characterized by an excess amount of oxygen in large bodies of water
  4. is characterized by a rapid increase in the size of bacterial population
Answer and Explanation :-

Answer: Option 4


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Have you noticed how nobody ever looks up? Nobody looks at chimneys, or trees against the sky, or the tops of buildings. Everybody just looks down at the pavement or their shoes. The whole world could pass them by and most people wouldn't notice.
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