Answer quick

which of the following is a principle of natural selection

most organisms are infertile or produce nonviable offspring.

members of a species are genetically identical.

variations are acquired during an individual's lifetime and so are not passed to offspring.

variations allow individuals to survive and reproduce better than members who lack these variations.

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.