Baltimore Oriole Black-backed Oriole Female Male Kondo, Baker, & Omland 2004 2B. Based on the morphological information above, should the Baltimore Oriole and Black- backed Oriole be classified as one species or two species? What if we only had information about females?

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Evolutionary lineages

An evolutionary lineage is a series of populations of organisms that descend from a common ancestor. Each species in the lineage is the direct consequence of evolutionary change from a common ancestor. A phylogenetic tree is generally used to display lineages visually. Lineages are components of the phylogenetic tree of life. Molecular systematics procedures are widely used to predict lineages.