Suppose That Two Groups of Humans Became Completely Isolated from One

Multiple Choice

Suppose that two groups of humans became completely isolated from one another for a very long period of time due to a geographic barrier and that each group had very different environmental conditions with which to contend.What might be true?

A) Gene flow would occur between the two populations.
B) Speciation could occur,since the human species already exists.
C) The scenario described is an example of sympatric speciation.
D) The two populations would be subject to identical selective pressures.
E) If speciation occurred,reproductive isolation would necessarily end if the two species later inhabited the same area.