#36 - How long does natural selection take to happen?

Character C says that natural selection could take place in a single generation if there were dramatic changes, such as severe drought, or an epidemic of a fatal disease. Answers A and B are correct in that natural selection certainly does occur over long periods of time, but that much time is not always needed (speciation on the other hand, typically takes a very long time). Answer D is denying that species change.

 

See also main cartoons page and Biology Lessons home page.