Renowned for their high diversity and amazing fish life (the Great Barrier reef holds 300 coral species, 1,500 fish species, and 4,000 mollusk species), coral reefs are the second most productive ecosystem on earth.
(the Great Barrier reef; holds; 300 coral species, 1,500 fish species, and 4,000 mollusk species) (coral reefs; are; the second most productive ecosystem on earth)
the Great Barrier reef coral reefs
holds are
300 coral species, 1,500 fish species, and 4,000 mollusk species
the second most productive ecosystem on earth