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In the late 1960s, ecologist Robert Whittaker proposed adding a fifth kingdom to Linnaean taxonomy to represent fungi. Fungi are eukaryote organisms such as mushrooms and molds. Up until then, fungi had been classified in the plant kingdom. Whittaker separated fungi from plants on the basis of differences in metabolism. Plants make their own food in the process of photosynthesis, whereas fungi obtain nutrients by breaking down dead organisms (see the Fungichapter). Separating fungi from plants resulted in five kingdoms, which are illustrated in Figurebelow. The five-kingdom system soon became widely accepted.

From: http://science-dfjhs.web.nebo.edu/home/Biology/taxonomy-and-evolution/tax1/t2

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