What was the observed proportion of moths in England before industrialization in the 1850s?

Step-by-step solution

Before industrialization in the 1850s, there were more white-winged moths observed on trees compared to dark-winged moths.The explanation put forth for this observation was that ‘predators will spot a moth against a contrasting background’ . During post- industrialisation period, the tree trunks became dark due to industrial smoke and soots. Under this condition the white-winged moth did not survive due to predators, dark-winged or melanised moth survived. Before industrialisation set in, thick growth of almost whi