What type of behavioral adaptation is sleeping? why?

How does natural selection change thephenotypes within a population over time?

Most animal cell membranes have proteins that pump. ions out of the cell and potassium ions into this

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.