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The trees are bright and are clean this means the white moth can blend in with the tree
Therefore the birds est the black moths
In 1820 the industrial revaluation started to use machines and factories it produced black suite which stained the trees a darker colour
because the tree is dark the dark moth now camouflage in and the white moths stand out
The birds now ate the light colourd moths and the population of dark moths icreased.
Now when the clean air act came in to place in 1956 the white moths overtook the black moths and returned to how it was
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