No. Phytoplankton are plants themselves, and they derive their energy from sunlight!
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Plankton eat seeweed as a green plant at the start of a food chain. They eat it because it gives them energy from the sun.
Plankton eat a variety of different things. They eat everything from algae to seaweed to bacteria. Then, animals like whales eat the plankton.
No, phytoplankton makes it's food from photosynthesis. seaweed is only eaten by humans and some fish.
No. Zooplankton feed on bacterioplankton, phytoplankton, other zooplankton (sometimes cannibalistically), detritus (or marine snow).