II. protect the coastal areas from strong waves III. provide passage for strong currents to coast IV. serve as a breeding ground of fishes and oth A. I and II B. II and III @ I and IV D. III a Illa 15. Coral reefs are important to man and other marine A. collect corals C. ® clean coral reefs D. 16. Why are corals very important to marine life? A. They are the habitat of some marine animals B. They make the oceans and seas look blue. C. They filter and purify the water. D. They make the seawater salty.​