Discussion
Hybrid zone is a region where :
Answer: B
A hybrid zone is a region where genetically distinct populations meet and interbreed to some extent.
Hybrid zones form where two diverged populations or incipient species come into contact, mate and produce hybrids, as in the narrow zones between fire-bellied and yellow-bellied toads in Europe. Studying what happens there, reinforcement, fusion or stability, shows how reproductive barriers evolve.
'Hybrids can develop' is too vague, since hybrids may arise anywhere. Populations that cannot interbreed produce no hybrids, so they do not form a hybrid zone. Populations of one region exchanging genes is ordinary gene flow, not a zone of contact between distinct populations.
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