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By 1920, after industrialisation, the more numerous moths were:

ADeep winged
BDark winged
CDamp winged
DDull winged
Answer & Solution
Correct answer: B. Dark winged
1. Soot darkened the tree trunks and killed the lichens. 2. In 1920 there were more dark-winged moths than white ones. 3. Predators could now spot the white moths against the dark background. _Source: syllabus Biology, Ch 7 'Evolution'_
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