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Question

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


A
The waters they inhabit contain few nutrient resources
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B
A decline in nutrient input is disrupting their symbiotic relationship with zooxanthellae.
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C
The degraded waters of their marine habitats have reduced their ability to carry out photosynthesis.
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D
Waste by-products result in an increase in nutrient input to reef communities.
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Solution

The correct option is B 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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