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| a grouping of tissues into a distinct structure, as a heart or kidney in animals or a leaf or stamen in plants, that performs a specialized task |
| the ability of a population to maintain or increase its numbers in succeeding generations |
Protista Pro·tis·ta (prō-tĭs'tə)
n.
A former taxonomic kingdom made up of eukaryotic, unicellular organisms. Members of Protista now belong to the kingdom Protoctista, a new classification in most modern taxonomic systems.