What would happen without coral reefs?

The ratio of coral reefs in the ocean ecosystem is very less, still, its absence would severely affect marine and human life. The three greatest threats without coral reef would be:

  1. Half of the oxygen in the ocean is produced by corals.  If coral reefs are not there, living beings would not be able to survive
  2. Billions of sea species would suffer
  3. It would affect the livelihood of people, food source of people and also affect the economy

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