Rocky Mountain Juniper (Juniperus Scopulorum) and One-Seeded Juniper (J

Multiple Choice

Rocky Mountain juniper (Juniperus scopulorum) and one-seeded juniper (J. monosperma) have overlapping ranges. Pollen grains (which contain sperm nuclei) from one species are unable to germinate and make pollen tubes to bring the sperm nuclei to the female ovules (which contain egg cells) of the other species. These two juniper species are kept separate by ________.

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