The Northern leopard frog (Rana pipiens) and Southern leopard frog (Rana utricularia) are morphologically similar, but they do not mate. They sound very different when calling for a mate. Which mechanism may explain why these frogs are listed as separate species?
A) the inability to interbreed because of morphological differences.
B) the difference in bone structure and skin color of the organisms.
C) DNA sequences of particular genes.
D) the habitat of the organisms.
E) both the DNA sequences of particular genes and the inability to produce viable offspring.
Correct Answer:
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