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? 
Definitions:
Different Perspectives
Various ways of viewing or interpreting a situation, problem, or concept, emphasizing the diversity of viewpoints.
Stipulative Definition
A definition that assigns a meaning to a word for the first time, often without regard for common usage.
Polygamy
A marriage practice where an individual has more than one spouse simultaneously.
Renal Failure
A medical condition where the kidneys lose their ability to filter waste and excess fluids from the blood effectively.
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