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Rocky Mountain juniper (Junipers scopulorum) and one-seeded juniper (J. monosperma) have overlapping ranges. If pollen grains (which contain sperm cells) from one species are unable to germinate and make pollen tubes on female ovules (which contain egg cells) of the other species, then which of these terms are applicable?1. sympatric species2. prezygotic isolation3. postzygotic isolation4. allopatric species5. habitat isolation6. reduced hybrid fertility

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