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In the 19th century pollution made the bark of many tree go black. Explain why
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In the 19th century pollution made the bark of many tree go black. Explain why

User Amit Vujic
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Briefly, the moth has several genetic forms, the most famous being the “typical” or white form, which is ivory colored with peppery black spots: i can give more info if u like?
User Igor Kustov
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