Acertain species of butterfly varies in color from white to dark blue. the birds found in the same area feed on the white or lightly colored butterflies, leaving butterflies that are darkly colored. this may result in what type of selection?

Directional selections

Explanation:

Directional selections occur when a certain phenotype is favored by the environment, reproductive preferences or other situations that favor a certain characteristic make the dna of a certain species to shift into that direction, in this case the lighter coloured butterflies are eaten by the birds, so eventually more and more dark butterflies will start to born because of this.

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.