| Scientific classification - encyclopedia article about Scientific classification. (3088 words) |
 | In biology, the theory of universal common descent proposes that all organisms on Earth are descended from a common ancestor or ancestral gene pool. |
| In biology, systematists are the scientists who classify species and other taxa, which they do with the aim of defining how they relate evolutionarily. |
| It is used in biology when the organisms within a species fall into separate groupings that need to be distinguished. |
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