In a town in England, the wings of a local butterfly species had a black and white pattern. Over the years, as air pollution worsened in the town, a coat of black soot often covered everything. From an evolutionary perspective, which of the following is a logical sequencing?
◦ Butterflies became blacker because the ones with relatively more black on their wings were most likely to blend in with the sooty background.
◦ Butterflies became lighter because the ones with relatively more white on their wings were least likely to blend in with the sooty background.
◦ Butterflies became more aggressive because their behaviors were altered by the toxins that were in the black soot.
◦ Butterflies morphed into moths because environmental conditions triggered an unfolding of a hidden gene.
A king cheetah showing its distinctive coat pattern
black widow spider
Small Town USA: Struggling to Survive
Local Anesthetic Agents
Great White Shark (Carcharodon carcharias).
Black-tailed Prairie Dog (Cynomys ludovicianus).