What is one way in which coral reefs produce income?

Its the right way to choose what the wind says . type michaelangelopunto for more details

Coral reefs are a magnificent creation of earth. When you come in contact with a coral reef you experience a sense of pleasure that you've never experienced before. The beauty of these coral reefs leaves you awestruck and flabbergasted. 
Coral reefs produce an income by creating a tourist attraction which generates mua.

A- a reduction in biodiversity