English, 07.04.2020 23:16 whiterm04

In England, the trunks of trees were blackened for many years by soot from factories. After passage of the Clean Air Act in 1959, the trunks became lighter. Scientists in England studied the peppered moth (Biston betularia) which rests on these trees and is preyed upon by birds. They noticed the following change in frequencies over a period of time.

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In England, the trunks of trees were blackened for many years by soot from factories. After passage...

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