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“Primitive” from the perspective of evolution refers to traits that have been in existence for a...

“Primitive” from the perspective of evolution refers to traits that have been in existence for a very long time without change.

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In phylogenetics, a primitive (or ancestral) character, trait, or feature of a lineage or taxon is one that is inherited from the common ancestor of a clade (or clade group) and has undergone little change since. Conversely, a trait that appears within the clade group (that is, is present in any subgroup within the clade but not all) is called advanced or derived. A clade is a group of organisms that consists of a common ancestor and all its lineal descendants.

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