Explanation:

The coral is a polyp, an organism that lives in the shallow sea. Its skeleton is composed of limestone and dolomite. The layers of deposition of the skeletons of these polyps form a shallow rock known as Coral Reef.

• They thrive in tropical oceans confined between 25 degrees North and 25 degree south latitudes. Corals are found mainly in the tropical oceans and seas because they require a high mean annual temperature above 20 degree celsius.
• Most fishes lay eggs in coral colonies. 
• Since coral polyps cannot survive above water level, coral reefs are found either up to sea level or below it.
• The coral reefs are more diverse than tropical rainforests because coral reefs have more than 1,000,000 species.

    Hence all the statement are correct.