Suppose related animals in the Nearctic and the Palearctic biogeographic regions tend to be more distantly related than related animals in the Neotropical and the Ethiopian regions.What would be the most likely explanation for this difference?
A) The Nearctic and the Palearctic separated from each other earlier than the Neotropical and the Ethiopian did.
B) The Nearctic and the Palearctic separated from each other more recently than the Neotropical and the Ethiopian did.
C) There was more biotic interchange between the Nearctic and the Palearctic.
D) There was more adaptive evolution in the Nearctic and the Palearctic.
E) The Wallace line impeded evolution in the Nearctic and the Palearctic.
Correct Answer:
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