Two Juniper Trees (Juniperus Scopulorum and J

Two juniper trees (Juniperus scopulorum and J. monosperma) have overlapping geographic ranges. 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. Which of the following isolating mechanisms keeps the two species separate?

A) habitat isolation
B) temporal isolation
C) gametic isolation
D) behavioral isolation

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