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Explanation:
Sharks are considered tertiary consumers in the food chain. They feed on the big fish that consume parrotfish, which in turn feed on marine plants .
The marine food chain consists of several levels. At the bottom are the producers, such as marine plants and phytoplankton, which create their own food through photosynthesis . The next level consists of herbivores, including parrotfish, that feed on the marine plants . The big fish, which are carnivores, feed on the parrotfish . Finally, the sharks, along with other top predators like tuna and dolphins, are tertiary consumers that feed on the big fish .
It's important to note that not all sharks are hunters. Some species, like the whale shark, primarily feed on zooplankton and are not considered top predators in the traditional sense . However, many sharks are voracious predators and play a crucial role in the saltwater food chain .
Overall, the food chain in the ocean is a complex system where small organisms are eaten by larger ones, with sharks occupying the top predator position
