A 'roll call' by the Census of Marine Life scientists surveyed 25 key regions around the world and identified Australian and Japanese waters as the most biodiverse on Earth.
Each ocean zone contains an estimated 33,000 known forms of life, ranging from algae and single-celled protozoa to whales and sea birds. But for every marine species of all kinds known to science, experts estimate that at least four are yet to be discovered.
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