What advantage does cross pollination have over self-pollination? It assures that there is genetic variety within each plant species.
It allows a plant to have both male and female flowers.
It allows a plant to fertilize itself.
It ensures that all offspring will be identical.

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population.b) the separated population is small, and genetic drift occurs.c) the isolated population is exposed to different selection pressures than the ancestral population.d) different mutations begin to distinguish the gene pools of the separated populations.e) gene flow between the two populations is extensive.