When sound waves enter the outer wall of the ear, what is the first thing they strike? Group of answer choices A. the ear drum B. the cilia C. the three tiny bones of the middle ear D. the cochlea

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.