Rooted and Unrooted Trees
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A rooted tree identifies a single ancestral lineage all included organisms trace to; an unrooted tree shows relationships without identifying that ancestor.
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A rooted tree of life's three domains traces Bacteria, Archaea, and Eukarya to one shared origin point; an unrooted version omits that point.
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An unrooted tree still conveys relationships shown — it lacks only the ancestor, not all information.