It is a group of organisms belonging to the kingdom of Protista and there are single cells and multicellular and are present in places where fresh water or lakes are located and are characterized by the presence of a solid cellular wall and divided into several types of namely, green algae, brown algae, red algae, diatoms, pyrrophytes, and euglenoids. Well-known examples of algae are Volvox, Netrium, Spirogyra
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