How many ribs does a human being have? how many ribs does a human being have? follow 8 answers 8 report abuse are you sure you want to delete this answer? yes no

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:

c.           is the correct answer

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