Seaweed that requires sunlight for photosynthesis can only exist in the upper zones of the ocean.
What is the morning zone
The euphotic zone
Because it is a plant that has evolved to live in seawater. Some seaweeds also habit the littoral zone.
there is fish, whales, sharks, rays, seaweed, coral and etc.
Seldom do you find Paua below the 10m mark so sunlight might be a part of their life cycle, but then again the seaweed they eat tends to only grow in 10m of water or less.
the tidal zone.
no seaweed needs photosynthesis to grow.
They are found in the intertidal zone.
thw temperate zone or hot zone
The seaweed get nutrients from the sea water to live.
It's SEAweed
Seaweed, plankton, dolphins, whales, sharks, fish, krill, porpoises, jellyfish, and shrimp.