The best title for the student's paper is 'Speciation by Reproductive Isolation', highlighting the divergence of deer groups due to barriers in successful reproduction.
Speciation by Reproductive Isolation is the most suitable title for the student's paper on the separate evolution of deer groups due to the development of a canyon. This concept aligns with the process where new species arise as a result of barriers to successful reproduction. Reproductive isolation plays a crucial role in the divergence of populations.
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