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The most important, food-producing plants of the ocean are:

brown algae
phytoplankton
kelp
cyanobacteria

User Melessa
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SOS:

The answer is phytoplankton!!

Hope this helps!!

User Sid Steward
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It is phytoplankton

Phytoplankton are microscopic ocean plants that form the base of ocean ecosystems; they are so abundant that they are visible from space. ...
Phytoplankton are tiny microscopic plants - algae - that form the base of the marine food chain.