About 40% of the world's photosynthetic productivity occurs in _________floating in the oceans.

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Phytoplankton are small plants and algae that drift in open water and are the basis of the oceanic food chain. They also contribute significantly to global photosynthesis, accounting for about 40% of the world's photosynthetic productivity. Seaweeds and macroalgae are larger, stationary marine plants that grow on or near the seafloor, while zooplankton are small, drifting animals that feed on phytoplankton.

About 40% of the World's Photosynthetic Productivity Occurs in _________Floating