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algae that lives inside the coral produces the oxygen. Now if it is 50% I'm not sure but when I double checked the facts, which does sound to good to be true, found a couple of articles online mentioning that coral reefs generate (or are responsible for) half of the oxygen on earth. Unless everyone is qouting same resource which is unreliableSorry coral does NOT produce the amount of oxygen that is referenced in the video. No, not even close!