Name a species of marine algae which are used as food.

Marine algae

1. Marine algae are an important primary producer in the marine food chain and affect the biogeochemical cycle of arsenic in the marine ecosystem.
2. They are simple photosynthetic eukaryotes that can be both multicellular as well as unicellular.
3. They can grow in any aquatic form, such as ocean, river, pond and lake.
4. Algae have been used as food for a very long time.
5. Common examples of marine algae are Sargassum, Porphyra, and Laminaria.