Question: You are presented with the question "what do coral polyps form?" and the following answer choices: - lagoon - graptolites - a cuticle - barnacles - bioaerosols - cave - coral reef - salt and water. Now knowing that many corals secrete an exoskeleton that builds up to become a coral reef and coral reefs are made up of the accumulated exoskeletons of the coral polyp, choose the best answer.
Answer:
coral reef