"we now still have light and dark moths . The only thing that has changed is the population ratio , assumably by * natural selection * ."
"Exactly . That the change in moth color was due to natural selection was first posed in about 1896 by J.W . Tutt . The funny thing is that as pollution increased , the moths turned black , and then as the pollution was cleaned up , they turned white again . carbonaria have become pretty scarce ."
"we now still have light and dark moths . The only thing that has changed is the population ratio , assumably by * natural selection * ."
"Exactly . That the change in moth color was due to natural selection was first posed in about 1896 by J.W . Tutt ."