In the phylogeny depicted in the figure, the P species are from the Pacific side and the C species are from the Caribbean side of the Isthmus of Panama. Which of the following is the most likely cause of speciation? 
A) sympatric speciation
B) parapatric speciation
C) allopatric speciation via dispersal across the Isthmus of Panama
D) allopatric speciation via isolation when the Isthmus of Panama closed
Correct Answer:
Verified
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