How does biogeography show evidence of common ancestry?

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation:

frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;