The Northern leopard frog (Rana pipiens) and Southern leopard frog (Rana utricularia) are morphologically similar, but their mating calls sound very different. Based on this, what is the best explanation for why these frogs are considered separate species?

Question

Answer

They do interbreed, produce fertile hybrids, but the offspring of these hybrids are sterile.

Answer

They have undergone habitat isolation because one species is entirely terrestrial while the other is entirely aquatic.

Answer

They are too morphologically different to interbreed.

Answer

They have undergone behavioural isolation which prevents them from interbreeding.

Answer

They do interbreed, but produce sterile hybrids.

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The Northern leopard frog (Rana pipiens) and Southern leopard frog (Rana utricul...

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