In an ocean, the parrotfish feed on marine plants, big fish feed on parrotfish, and sharks feed on the big fish. What are sharks in the food chain? A. producers B. primary consumers C. secondary consumers D. tertiary consumers E. decomposers

Tertiary consumers

Explanation:

A tertiary consumer in a food chain is an organism which is carnivorous in nature, which means it feeds upon other organism belonging to lower trophic level like secondary and primary consumers. In ocean foodchain the parrotfish feeds on marine plants which are producers and parrotfish is a primary consumer. This parrotfish is eaten up by big fish which is a secondary consumer. This big fish is feed up by shark. Therefore, shark belongs to tertiary consumers.