From the information it is possible to conclude that A - VCE - SSCE Biology - Question 24 - 2004 - Paper 1

The information suggests that changes in the environment, particularly the increase in soot from industrial activities, influenced the relative fitness of the moths. Before industrialization, lighter-colored moths may have been better camouflaged against lighter tree bark. However, as the trees became covered in soot, darker-colored moths would have had a survival advantage. This change indicates that the relative fitness of the moths depended heavily on the environmental context, leading to an increase in the frequency of the B allele in response to the shifting environmental pressures.