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  4. Populations of peppered moths ( underline text Biston betularia ) of England changed from 1 % dark and 99 % light individuals to 99 % dark and 1 % light individuals between 1848 and 1898. The selective agent causing the change was

Q. Populations of peppered moths $(\underline{\text { Biston betularia })}$ of England changed from $1 \%$ dark and $99 \%$ light individuals to $99 \%$ dark and $1 \%$ light individuals between $1848$ and $1898$. The selective agent causing the change was

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