The Great Barrier Reef , the world's largest system of coral reefs, covers 349,000 square kilometers and occupying only one-tenth of one percent of the ocean surface, supports: nearly 8 percent (1,500) of the world's fish species, more than 700 species of coral, over 4,000 species of mollusks.
(The Great Barrier Reef; covers; 349,000 square kilometers) (The Great Barrier Reef; occupying; only one-tenth of one percent of the ocean surface) (The Great Barrier Reef; supports; )
The Great Barrier Reef The Great Barrier Reef The Great Barrier Reef
covers occupying supports
349,000 square kilometers
only one-tenth of one percent of the ocean surface