In the marine environment, the main primary producers are:

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Phyto Planktons. Phytoplankton serves as the major primary producers in the marine ecosystem. These microscopic single celled plants, bacteria, algae and other organisms harvest sunlight through photosynthesis and store it as chemical energy before becoming food for tiny creatures called zooplankton. The zooplankton falls prey to larger animals like small fish and jellyfish and these in turn become meals for larger fish, squids, sharks and marine mammals. The phytoplankton rest at the bottom of these food chains because all the energy used by these larger organisms comes from them.

In the marine environment, the main primary producers are:

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