* Primary consumers: Primary consumers are organisms that feed directly on plants or other producers. Examples of primary consumers in marine ecosystems include zooplankton, small fish, and sea urchins.
* Secondary consumers: Secondary consumers are organisms that feed on primary consumers. Examples of secondary consumers in marine ecosystems include larger fish, seabirds, and marine mammals.
* Tertiary consumers: Tertiary consumers are organisms that feed on secondary consumers. Examples of tertiary consumers in marine ecosystems include sharks, killer whales, and humans.
Starfish are typically considered to be secondary or tertiary consumers, depending on the prey they consume. For example, a starfish that eats mussels is considered a secondary consumer, while a starfish that eats sea urchins is considered a tertiary consumer.
In addition to their role as predators, starfish also play an important role in the food chain as prey for other animals. They are eaten by a variety of marine animals, including fish, birds, and sea otters.
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