HELPP!! in classifying organisms, scientists use a system that separates organisms into smaller and smaller groups based on increasingly specific and similar characteristics. If you were to sort each of your three groups into smaller groups, what criteria would you use? please help id. k this

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.