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Seaview Science: How diverse is the life of the coral reef?

Coral reefs are regarded as the most biologically diverse ecosystem on the planet. On the Great Barrier Reef there are said to be well in excess of 100,000 living species, worldwide scientists guess there are as many as 1 million species living on coral reef ecosystems. Join Professor Ove Hoegh-Guldberg underwater on the Great Barrier Reef as he shares more about the biodiversity of this amazing ecosystem.