Refer to the paragraph about the formation of the Isthmus of Panama. The sister populations on opposite sides of the isthmus are true species under which species concept?
A) the morphological species concept
B) the biological species concept
C) the phylogenetic species concept
D) both the morphological species and phylogenetic species concepts
E) the morpholoogical species, biological species, and phylogenetic species concepts
Answer: E
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