Phytoplankton play a key role in the earth's oceans, since they produce a huge amount of oxygen through photosynthesis. Most of the earth's production of oxygen is a result of phytoplankton.
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The function o the phytoplankton in ocean ecosystem is A. producer. <span>Phytoplankton produce their own energy through a biological process or chemical reaction. They are a key factor of the aquatic biome.</span>
