State the role of meiosis in humans

Which of the following is a possible reason for sleep? a) growth b)digestive c)speed d)intelligence

In the water cycle , when does water undergo a chemical change

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.