Major Groups of Organisms Faced with the multiplicity of organisms in the world, classifying them into groups with like characteristics makes talking about them, identifying them, and describing them easier. Utilitarian groupings—poisonous plants, trees that produce edible fruits, animals that sting, and so forth—are useful today as in the past, however, they provide information about only one aspect of organisms' lives. For decades researchers have accumulated libraries of information about creatures large and small. Systematists (the biologists concerned with classification and naming of organisms) have arranged much of this information into schemes that provide not only descriptions and names for organisms, but also show hereditary relationships among and between members of the various groups. Indeed, one of the principal objectives of systematics is to determine as best as possible—
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