During the embryonic stage, Species X, Species Y, and Specie…
During the embryonic stage, Species X, Species Y, and Species Z all exhibit the presence of a structure called the ‘pharyngeal arch.’ In the adult stage, Species X retains the pharyngeal arch as functioning gills, while Species Y and Species Z lose this structure. Why is the presence of the pharyngeal arch in the embryonic stage of all three species considered an example of developmental homology?
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