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Any of a wide variety of multicellular eukaryotic organisms, belonging to the kingdom Plantae and including the bryophytes and vascular plants. Plant cells have cell walls made of cellulose. Except for a few specialized symbionts, plants have chlorophyll and manufacture their own food through photosynthesis. Most plants grow in a fixed location and reproduce sexually, showing an alternation of generations between a diploid stage (with each cell having two sets of chromosomes) and haploid stage (with each cell having one set of chromosomes) in their life cycle. The first fossil plants date from the Silurian period. Formerly the algae, slime molds, dinoflagellates, and fungi, among other groups, were classified as plants, but now these are considered to belong to other kingdoms. See Table at taxonomy.