Identify the mechanism for isolation described using the drop-down menus. The red-legged frog breeds in ephemeral ponds from January through March. Its relative, the bullfrog, breeds in permanent ponds from late March through May.

The frogs breed at different times: the red-legged frog breeds from January through March, while the bullfrog breeds from late March through May. Differences in breeding timing can prevent the species from mating, which is temporal isolation. The correct choice is temporal isolation.

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