The endosymbiotic theory states that chloroplasts and mitochondria evolved as a result of
a prokaryotic cell engulfing a bacterial cell.
a eukaryotic cell engulfing a bacterial cell.
a bacterial cell engulfing a prokaryotic cell.
a bacterial cell engulfing a eukaryotic cell.

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.