"Seaweed" is a general term for marine algae such as kelp, laver, Undaria pinnatifida and cauliflower. It grows in the sea and is a cryptophyte in the plant kingdom. Algae include several different kinds of organisms that produce energy through photosynthesis.

They are generally regarded as simple plants, and their main characteristics are: no vascular tissue, no real differentiation of roots, stems and leaves; No flowers, no fruits and seeds; There is no special protective tissue in reproductive organs, and spores or gametes are often produced directly by a single cell; There is no embryo formation.

The general name of algae, usually fixed on the seabed or solid structures, is a single plant or a long list of simple plants composed of basic cells. A large number of aquatic plants cannot produce stems or leaves when they appear.

There are many kinds of organisms named seaweed, which are very different in shape and span many life forms. * * * The same thing is that they mainly live in seawater and can synthesize organic matter through their own pigment bodies and photosynthesis.