Wind is considered an abiotic factor because it is not a living organism.
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A pollutant is a substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource.
So the dark butterfly camouflages better on the tree. Where as the white one can clearly be seen and identified. A predator will also easily spot it and kill it. The dark butterfly has evolved over time to the color that it is, to best help it survive. This is also shown in the tread on the graph.
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