There are only a few true plants in the oceans; these include salt marsh grasses and mangrove trees. But large algae, or seaweed, also use photosynthesis to make food, just as plants do on land. These organisms have to live in the photic zone, because they require sunlight for photosynthesis. For that reason, most plants, seaweeds and algae in the ocean are found near the ocean surface or close to the shore.
THE ANSWER ISSARGASSUM
sargasum
The floating gardens used by the Aztecs were called chinampas. These were artificial islands made from reeds, mud, and soil piled on top of rafts. They were used for growing crops such as corn, beans, squash, and tomatoes.
Kon-tiki
Pallia
The Aztec created floating gardens called chinampas in the swamps. These were man-made islands built by layering mud and organic material on top of rafts of reeds and sticks. The nutrient-rich mud helped crops grow, and the gardens were irrigated by canal systems.
Yes, they do and live groups called rafts.
They were called chinampas. With too little land for agriculture, the Aztecs would starve if they didn't find a way to farm. Using reed rafts, they piled dirt and used the fertile soil from the lakebed. They used stakes to hold these rafts and planted trees so the soil wouldn't just float away. Since the soil was very fertile, the crops were good.
A large group of sea otters is called a raft.
the mojave rafts are made of balsa. I think... I'm pretty sure.
Sea otters live in kelp forests in groups called rafts various places.
The current theory is that they got there by island-hopping using simple boats and rafts during a time when the ocean water level was lower than it is today.