Defining "homology" Understanding why certain sorts of similarities stretch across large swaths of the biological world is a question that has fascinated biologists since before evolution provided a unifying theme for biology. It is hardly surprising that explanations drawn from the pre-evolutionary thinking of the early 19th century would have flaws in the modern evolutionary context. "Homology" is one such concept, and biologists debate the meaning and significance of that particular term because of its historical baggage. To clarify discussions of similarity and difference in an evolutionary context, biologists have coined new terms which avoid the confusions that Explore Evolution 's chapter on homology chooses to wallow in. The central error in the homology chapter lies in the authors' narrow focus on that particular word, rather than discussing the more modern concepts that scientists actually use to study morphological similarities and differences. The focus on outmoded terminology will only
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