Before the Industrial Revolution most peppered moths were light, but in polluted areas dark moths became common. This is best explained by
Answer and explanation
Correct answer: A. natural selection favouring dark moths on sooty trees
- Step 1: Birds ate light moths more often in polluted areas, so the dark allele became more common.
Answer
natural selection favouring dark moths on sooty trees.
Why not the others: individual moths changing colour to match the sooty trees they rested on: individual moths do not change colour in response to the environment. mutation caused directly by the pollution acting on the moths' genes: mutations are random and the dark allele was already present. dark moths migrating into polluted areas from other regions: the change came from differences in survival, not migration.
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