Many corals secrete an exoskeleton that builds up to become a coral reef.
Coral reefs are made up of the accumulated exoskeletons of the coral polyp.
Coral polyps form reefs.
what do coral polyps form?
(1) lagoon
(2) graptolites
(3) a cuticle
(4) barnacles
(5) bioaerosols
(6) cave
(7) coral reef
(8) salt and water.