A hybrid zone is properly defined as
a. an area adjacent to tow closely related species
b. an area where mating occurs between members of two closely related species, producing viable offspring
c. a zone that features a gradual change in species compostion between two neighboring ecosystems that border each other
d. a zone that includes the intermediate portion of a cline
e. an area where members of two closely related species intermingle, but experience no gene flow.
Answer: b. an area where mating occurs between members of two closely related species, producing viable offspring
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