Seagrass is a oceanic flowering plant. It is called seagrass due to its long and narrow leaves. They grow in meadows and are found in many places on the ocean floor. Seagrass is also a very critical part of the oceanic food chain. Manatees, turtles, fish, sea urchins, crabs and many other organisms feed on seagrass.
Coralline algae is very important for the ecology of coral reefs. Usually coralline algae is pink or dark red, but occasionally they can be purple, yellow, blue, white, and a grayish green. Some species can live in brackish water, but there are no coralline algae species living in fresh water. It is found in many places in the world, mostly on the rocky ocean floor.
Sea lettuce is an edible clump of algae. It is eaten by many animals: manatees, sea slugs and even humans. Humans use sea lettuces in many recipes, including served raw in salads or cooked in soup. It is considered very high in protein, iron, and minerals.