According to the passage, which of the following is a factor that is threatening the survival of coral reef communities?

The waters they inhabit contain few nutrient resources

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A decline in nutrient input is disrupting their symbiotic relationship with zooxanthellae.

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The degraded waters of their marine habitats have reduced their ability to carry out photosynthesis.

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Waste by-products result in an increase in nutrient input to reef communities.

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Solution

The correct option is D Waste by-products result in an increase in nutrient input to reef communities.
Option D

The author says that human activities such as agriculture, slash-and-burn land clearing, sewage disposal and manufacturing create waste by-products and increase nutrient loads in these waters thereby threatening reef communities sensitive to subtle changes in nutrient input to their waters. Option (D) is the obvious choice

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