How are atolls built?
important habitats By coral exoskeletons by fish with machines by a type of eel It used to be covered by water The area was once underwater reusing materials
A B C D E F G H
An atoll is the third type of reef.
Atolls are built by corals secreting an exoskeleton.
How are atolls built? (A) important habitats (B) By coral exoskeletons (C) by fish (D) with machines (E) by a type of eel (F) It used to be covered by water (G) The area was once underwater (H) reusing materials