What happen to cause the trends in the proportion of black peppered mouth?

The trends in the proportion of black peppered moths are primarily attributed to industrial pollution during the Industrial Revolution in England. As soot and pollutants darkened tree bark, the lighter-colored moths became more visible to predators, leading to a decline in their population. Conversely, the darker moths had a survival advantage in this environment, leading to an increase in their numbers. When pollution control measures were implemented, the environment began to recover, allowing lighter moths to regain their prevalence.