Mystery #2Tier 2-3evolution / adaptation
Why did peppered moths turn dark during the age of factories?
For ages, peppered moths in Britain were pale and speckled. Then, as smoky factories spread, dark moths took over, and when the air got cleaner again, the pale ones returned. A moth's colour tracked the pollution. How?
Your guess
What's your hunch about why dark moths took over when the trees got sooty, then pale ones returned when the air cleaned up?
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