The Ranges of the Red-Legged Frog and the Yellow-Legged Frog

question 38

Multiple Choice

The ranges of the red-legged frog and the yellow-legged frog overlap in California.The red-legged frog (Rana aurora,left) breeding season lasts from January to March.The closely related yellow-legged frog (Rana boylii,right) breeds from late March through May.What type of reproductive isolating mechanism is mainly responsible for keeping these two species separate?

• A)habitat isolation
• B)behavioral isolation
• C)temporal isolation
• D)mechanical isolation
• E)gamete isolation

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