Correct Answer: A
Solution :[a] The Great Barrier Reef is the world's largest coral reef system composed of over 2,900 individual reefs and 900 islands stretching for over 2,300 Kms over an area of approximately 344,400 sq kms. The reef is located in the Coral Sea, off the coast of Queens land, Australia. The Great Barrier Reef can be seen from outer space and is the world's biggest single structure made by living organisms.
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