A major difficulty facing systematists is:

Question

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Distinguishing similar features due to common ancestry from those due to convergent evolution is a major difficulty facing systematists. This is because convergent evolution can result in different organisms having similar traits even though they are not closely related, which can make it difficult to accurately classify organisms based on similarities alone. Sequencing DNA, placing specimens into predefined taxonomic categories, understanding embryology, and distinguishing anatomy from physiology are all important factors in systematics, but they are not necessarily the main difficulty facing systematists.

A Major Difficulty Facing Systematists Is