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| The logical principal that the most likely explanation of a phenomenon is the most economical or simplest. |
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| Similarity among organisms of different species due to convergent evolution. |
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| Similarity among organisms of different species due to their inheritance from a common ancestor. |
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| An evolutionary unit that includes an ancestral population and all of its descendants but no others. |
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Definition
| An evolutionary unit that includes an ancestral population and some, but not all, of its descendants. |
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| A shared, derived trait found in two or more taxa that is present in their most recent common ancestor, but is missing in more distant ancestors. |
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| Another name for a monophyletic group. |
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| In the phylogenetic tree, the point where two branches diverge. |
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| Sister Taxa (Sister Species) |
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Definition
| Closely related species, which occupy adjacent branches in a phylogenetic tree. |
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