Question

Corals is/are

• A. The tiny animals that live in shells in the sea.
• B. A special variety of fish which live in shells
• C. A particular type of shell found near some of the sea coasts.
• D. The remains of tiny sea animals resembling shells

Answer 1

The correct option is A The tiny animals that live in shells in the sea.

Corals are marine invertebrates within the class Anthozoa of the phylum Cnidaria. They typically live in compact colonies of many identical individual polyps. Corals species include the important reef builders that inhabit tropical oceans and secrete calcium carbonate to form a hard skeleton. A coral "group" is a colony of myriad genetically identical polyps. Each polyp is a sac-like animal typically only a few millimeters in diameter and a few centimeters in length. A set of tentacles surround a central mouth opening. An exoskeleton is excreted near the base. Over many generations, the colony thus creates a large skeleton characteristic of the species. Individual heads grow by asexual reproduction of polyps. Although some corals are able to catch small fish and plankton using stinging cells on their tentacles, most corals obtain the majority of their energy and nutrients from photosynthetic unicellular dinoflagellates in the genus Symbiodinium that live within their tissues.

So the correct option is 'tiny animals that live in shells in the sea'.