Industrial melanism involving the peppered moths (Biston sp.) is cited as an example of natural selection that has been observed in the last 100 years. Recall that the peppered moth exhibits two distinct morphological types with dark and light colored wings. Which of the following statements about changes in these two types of moths as a result of industrial melanism is true?
A. Birds prey more on the dark forms in polluted forests
B. The dark forms are distasteful to birds and are thus safe in polluted forests.
C. Dark forms emigrate from nonpolluted forests to polluted forests.
D. The light forms are selected against in nonpolluted forests.
E. The dark forms are selected against in nonpolluted forests.
Answer: E
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