What kind of symmetry does the human body plan show? Explain what this means.

Name the part of the the brain labeled "e".

What substance is the most acidic. lemon juice. tomato juice. sodium hydroxide. water

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.