1. What is a coral reef? It is
A. A terrestrial habitat composed of limestones and rocks
B. Made from stony corals and discharged limestones skeletons
C. Fossilized remnant of rainforests that were once above the
water
D. They belong to the living organisms above the sea
2. When polyps are joined together into a colony, what happens to
them?
A. They work together as a single colony
B. They form larger working groups competing with the other group
C. Each polyp continues to operate individually from a common
location.
D. Each sea creatures survived​