Each time Amelia feeds her pet parrot Pete, she walks into the room and says,"Good morning Pete!". She now notices that as soon as Pete hears her say "Good morning!" he starts fluttering around his cage in excitement. In this example the food is the

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.