The coral kingdom protected against
1. sharks
2. men
3. both sharks and men

3. both sharks and men

Explanation:

A coral kingdom is an underwater ecosystem that includes the coral polyp species which forms the reef of hard calcium carbonate substance. These reefs are formed by the colonies of coral polyp and other animals which lives either in the symbiotic association with the coral colonies or live to obtain shelter and nourishment.

The coral kingdom are in danger of being damaged by both men and sharks. The sharks search for organisms which they can feed inside the coral reefs. Hence, sharks destroy these habitats forcefully. Coral kingdoms are affected by the human beings due to activities like coral mining for obtaining minerals, overfishing, and underwater pollution.