Respuesta :
The two species do not interbreed because of temporal isolation.
What is temporal isolation?
Temporal isolation, in biology, a type of reproductive isolation mechanism among organisms in which the differences in the timing of critical reproductive events prevent members of closely related species, which could otherwise breed with one another, from mating and producing hybrid offspring.
The American toad breeds earlier in the spring than the Fowler's toad does. Therefore, they do not interbreed, even though they often live in the same habitat.
Learn more about temporal isolation here:
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