Which of the following is the best example of a physical system? a) A city
b) A school
c) A hospital
d) A television

A) a city would be bet

After the pollution from the Industrial Revolution started affecting trees, most of the collected peppered moths were of the dark form. ... They were eaten by birds more and more, while the rare dark colored moths blended in better on the darker trees. This made the dark colored moths have a higher survival rate.