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This is very complicated. Corals can die for many reasons, old age, extreme environmental temperatures, salinities, light, sediments, pollutants, algae overgrowth, etc. Some corals have short life spans and die when they reach a certain size or age, others seem to live forever. The tissue quickly rots away or is eaten by bacteria in days. The limestone skeleton takes much longer to vanish due to limestone boring organisms (algae, fungi, bacteria, sponges, worms, clams, etc.). All three. The coral itself is an animal in symbiosis with an alga (vegetable) that grows a solid mineral skeleton that builds the reef structure. Different organisms that live together with benefit to both partners. They create the most diverse and productive ecosystems in the sea whose fisheries, sand supply, shore protection, tourism, and biodiversity services are of the greatest economic importance to over 100 countries Human caused sources of coral death from global warming, diseases, pollution, and physical damage are rapidly wiping them out. The only solutions are to stop global warming, pollution, new diseases, and direct physical threats. Failing ending the major threats killing corals, the only solutions are to grow corals faster and more resistant to environmental stress. The Biorock® method is the only one that does so. Vast numbers, this is the most diverse marine ecosystem, but the majority of the species are still unknown to science. Don't understand the question. Corals have been systematically studied by direct underwater diving observation only over the last 60 years, starting with my father, Dr. Thomas F. Goreau, the world's first diving marine scientist. Depends on how big it grows. Some corals can live up to thousands of years. This depends on arbitrary human classification schemes. Every reef has a unique history and mix of environmental and biological factors affecting it. Depends on size. Most modern coral reefs are about 6,000 to 8,000 years old, when sea level stabilized near its current level. Yes, usually we classify the back reef, reef crest, and fore reef as separate habitats, but their extent depends on detailed history. Depends on how you classify and count them. Coral reefs occupy about one part in a thousand of the area of the ocean, other areas are too deep, cold, muddy, or nutrient rich for reef-building corals to grow. Most modern reefs go back nearly 8,000 years, but we are killing them many times faster than they can grow. Depends on species and conditions, but some are thousands of years old, although most only last a couple of years before dying. No one knows. Most coral reef species have probably not yet been identified by science. Pacific reefs can have more than 500 coral species, 1500 fish species, and uncountable numbers of other organisms. Very difficult, severe poverty due to having had no salary for 21 years. Whenever I can get someone to send a ticket. We are a global network of people working on direct action projects to study, save, and restore coral reefs. But we are all volunteers working for no money, as there is no funding in this field.
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