The diagram below represents the ranges of 3 species (A, B, and C), which are separated by a mountain range and river. It has been hypothesized that these three species arose via vicariance ecological speciation. Specifically, the entire area was originally occupied by a single species. Its range was split first by the mountain range. Later, the river formed, separating populations on the eastern side of the mountains. If this hypothesis is correct, phylogenetic analysis should reveal that: NIS A 44.4.4.4 C LEL B All three species are equally related to each other. Species A and B are each other's closest relatives (sister taxa). Species B and C are each other's closest relatives (sister taxa). Species A and C are each other's closest relatives (sister taxa).

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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.