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

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