Industrialization in England in the early 1900s produced black soot that covered many tree trunks and branches. At about the same time, the number of light-colored moths in this part of the country decreased over time. Why?
a. The soot killed only light-colored moths.
b. The light-colored moths became extinct.
c. The light-colored moths showed up against the dark tree bark and could be easily seen by the birds that fed on them.
d. The light-colored moths became isolated from other moths and reproductive speciation occurred.
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