Seaweeds, also known as macroalgae, comprise a diverse group of organisms representing various growth forms. In general, seaweeds are divided into three groups based on their color— green, brown and red—although colors within these groups vary. Seaweeds appear similar to land plants; however, seaweeds lack the complex reproductive structure (flowers) and functional tissues (roots, stems and leaves) found in seagrass and land plants.

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