Which of these might be a climax species? a. the first species in an area
b. the first insects to eat lichens
c. the most common weeds in a farm field
d. the oldest trees in a forest

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.