Natural factors<br>a. Biological erosion by fish, sponges, bivalves, parasites and other coral reef organisms.<br>b. Strong storm rain.<br>c. Invasion of alien species or substantial increase of species, such as the invasion of crown of thorns Starfish (Pacific Ocean).<br>d. Some experts believe that human induced climate change is the main cause of coral bleaching, but this argument is still controversial and needs to be confirmed. In addition, it is believed that the deterioration of water quality caused by pollution and storm runoff makes corals vulnerable to disease.)<br>
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