In recent centuries humans have, to a greater extent than ever before in our history, moved great distances and mated with individuals who were born in different places. If this pattern continues in the future, which of the following is the most likely evolutionary consequence? a. Allele frequencies will become more similar across populations; adaptation to local conditions will be reduced.
b. Mechanisms of evolution besides migration will cease to occur for any human population.
c. The overall rate of evolution will slow down to the point of being unobservable.
d. As populations become more mixed, the rate of occurrence of new mutations will be reduced.