In an Area in Europe Where the Fire-Bellied Toad Overlaps

In an area in Europe where the fire-bellied toad overlaps and breeds with the yellow-bellied toad, hybrid offspring-believed to have existed there for centuries-exhibit abnormalities such as misshapen mouths, fused vertebrae, and fewer than normal vertebrae.Hybrid survival is low compared with purebred individuals.This scenario illustrates the concept of

A) prezygotic isolating mechanisms.
B) habitat isolation.
C) gametic isolation.
D) postzygotic reproductive isolation.
E) behavioral isolation.

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