Answer:
Dark moth
Explanation:
The survival of the fittest.
Before, the white moth's characteristics made them the fittest moth to survive in this environment, but as the environment changed and the color of the trees got darker, the advantage shifted to the dark moths. The dark moth's characteristics are now the best ones to survive on the environment, and therefore they will multiply, while the number of white moths will decrease. Now the dark moth is the fittest, and will survive in larger numbers.
