Organisms must maintain homeostasis because cells function best when internal conditions
a) change at regular intervals
b) remain within a limited range
c) reflect external conditions
d) respond to positive feedback

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.