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alga - any unicellular, colonial, or filamentous eukaryotic organism belonging to kingdom Protista, with no root, stem, or leaf and having no nonreproductive cells in its reproductive structures, containing chlorophyll masked by red or brown pigment, and growing in water or damp places
Protista - kingdom of algae, amebas, and protozoans, consisting of photosynthetic autotrophs and heterotrophs