Due to white moths being in a dark environment (from environment changes), the moth has evolved its wings to become darker. Thus blending in with its environment to be less visible to birds. A way of survival. Their adaption is the darker wings to its dark environment
I think the cauae of substitution they involve swapping of one nucleotide for another during DNA repliction.For example,during repliction,a thymine nucleotide might be inserted in placed of a guanine nucleotide
