B

　　Filmmakers Michele dive into an eerie (怪诞的) world. The usually colorful corals are a ghostly white. Most of the fish, crabs, and other animals have disappeared. The reef is sick and dying.

　　Coral reefs are often called “the rainforests of the sea” because of their abundance of life forms. A great diversity of animals finds food and shelter in every crack and crevice.

　　Today’s reefs are about 10,000 years old. Found in sunny, shallow water in warm seas all over the world, reefs are made up of the hard shells of millions of corals. As corals live and die, they create a giant, rocky honeycomb. Only a thin top layer is living coral.

　　A reef grows only about as fast as your fingernails—three-quarters of an inch a year. But coral reefs are huge, and in time a healthy reef can be thousands of miles long

　　Millions of people around the world rely on reef fish and other animals for food. And reefs provide protection from storms at sea. Without thousands of miles of reefs surrounding coastal areas, many beaches and even whole islands could be destroyed by the pounding of powerful ocean waves.

　　“Let’s say a grazing animal like the parrot fish is overfished,” Michele explains. “Without them, the kind of algae (海藻) that the fish feed on could grow like weeds and take over the reef. The competition for space and sunlight could then starve the coral.”

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