What major contribution did james hutton and sir charles lyell make to the field of geology
a discovery of fossils in the la brea tar pits
b a new form of radiometric dating
c the principle of uniformitarianism
d names of the time periods in the geologic time scale

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.