which of the following sustainable energy source uses crops to create energy?
biofuels
geothermal
solar
wind

Which beat describes the brain stem

Me with biology endocrine system crossword also image left i need with hw

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.