Finches found on the isolated galapagos island are different species with different beak sizes and shapes, but are otherwise similar to a finch species found on the south american mainland. what might be the cause of the differences in the development of the beaks of these galapagos finches?

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.