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27. Why do we need to protect the coral reefs?
A they are tourist attraction.
C. they provide an abundant supply of fish
B. they make the water shallow D. they act as natural barrier and flood defense​


Sagot :

Answer:

D

Explanation:

A coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate. Most coral reefs are built from stony corals, whose polyps cluster in groups.

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