we commonly think of algae as:plants,"but the term algae is used to describe organisms belonging to the first three of the five kingdoms of life listed here;plantae(eukaryotic,multicellular,autotrophs);monera(prokaryotic,unicellular,autotrophs or heterotrophs);protista(eukaryotic,unicellular or simple multicellular autotrophs or heterotrophs);animalia(eukaryotic,multicellular,ingestive heterotrophs);and fungi(eukaryotic,multicellular,absorptive heterotrophs).