What types of animals live there? What important roles do cnidarians play in coral reefs? How do the tiny animals get their food? How do algae help the corals? Write a three-paragraph essay describing coral reefs.

How are Coral Reefs Described

Coral reefs are large underwater structures composed of the skeletons of colonial marine invertebrates called coral. ... Each individual coral is referred to as a polyp. Coral polyps live on the calcium carbonate exoskeletons of their ancestors, adding their own exoskeleton to the existing coral structure.

Your 1st answer was good btw

Particle exchange energy though elastic collision , hope this .