Which organisms form the basic foundation of the food chain in the ocean?

Name: Which organisms form the basic foundation of the food chain in the ocean?
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Question

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Phytoplankton are microscopic organisms that form the base of the ocean food chain. They are producers that convert sunlight into organic matter through photosynthesis. Other marine organisms, such as krill, shrimp, and jellyfish, feed directly or indirectly on phytoplankton, thus making it the foundation of the ocean food chain.

Which Organisms Form the Basic Foundation of the Food Chain