27.① Coral is an animal, a marine polyp that lives in vast colonies.
② Coral reefs are found in tropical waters, between latitudes 30 degrees north and south, in
the Western Atlantic, Indian, and Pacific Oceans.
③ Reefs are outcroppings that rise up from the sea floor.
④ While most of the reefs are the remains of dead coral, there must be good percentage of
living coral to ensure that the reef will continue to survive.
⑤ The calcium-based skeletons that they secrete build up over time to form vast reefs.
(A) ①③②④⑤
(B) ①⑤③②④
(C) ①②④③⑤
(D) ①②③④⑤
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