Which statement is true about fossils? a) there are more fossils in warm, wet tropical areas. b) no fossils resemble organisms that are presently alive. c) the oldest fossils are found in layers closest to the surface. d) the complexity of the organisms in fossil beds increases closer to the surface.

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.