In Kettlewell's research, the proportion of dark-colored moths increased as _____ increased.

Question

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Kettlewell's research focused on industrial areas where pollution levels were high. The peppered moths, which were typically light-colored, became easier for predators to spot in polluted areas. As a result, the proportion of dark-colored moths increased as they were better camouflaged against pollution-darkened trees.

In Kettlewell's Research, the Proportion of Dark-Colored Moths Increased as _____