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Common ancestorThe ancestral species that gave rise to two or more descendant lineages, and thus represents the ancestor they have in common. The idea of a common ancestor is central to evolutionary thinking from Darwin onwards. In the Modern Synthesis' Evolutionary Systematics the common ancestor is usually shown as the most suitable fossil form at the base [..]
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Common ancestorA lineage (often designated as a taxon) from which two or more descendant lineages evolved.
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