Cyanobacteria are important to the evolution and advancements of other life on earth because they a) were the first lifeform on earth. b) produced oxygen from photosynthesis. c) were the first group of organisms to leave a fossil record. d) were thought to have become mitochondria in the cells of animals.

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.