How would the results of this study have been different if factories produced white or light gray ash and soot rather than black?
(A) There would be no change to the results of the experiment.
(B) There would have been added selection pressure for more white-bodied spotted moths and against black-bodied spotted moths.
(C) There would have been added selection pressure for more black-bodied spotted moths and against white-bodied spotted moths.
(D) There would have been an increase in the frequency of both black-bodied and white-bodied spotted moths.

During the Industrial Revolution, a major change was observed in many insect species due to the mass production and deposition of ash and soot around cities and factories. One of the most famous instances was within the spotted moth population. An ecological survey was performed in which the number of spotted moths and longtail moths were counted in 8 different urban settings over a square kilometer in 1802. A repeat experiment was performed 100 years later in 1902.

Transcribed Image Text:

Number of Moths Detected / km² 40 30 20 10 White-bodied Pepper Moth 1802 1902 Black-bodied Pepper Moth Longtail Moths