Source: UPI 
January 23, 2012
"The complex relationship between fish and corals is a major factor in shielding reef species from extinction, Australian researchers say.
Those relationships developed relatively recently in geological terms, scientists at the ARC Center of Excellence in Coral Reef Studies said.
Early coral reefs, 300 million to 400 million years ago, were much simpler than today's colorful and complex systems, researcher Peter Cowman said, as fish had not yet become specialized to live on or among corals."
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