Here's one more i'm confused with

The correct option is D) .45

Explanation:

The results can be deduced by using the HARDY-WEINBERG LAW.

49% (Since blue is recessive, and the frequency of blue eyes in a population = q squared = .20, the frequency of the blue allele is the square root of q squared = the square root of .20 = .45. Therefore, p, the frequency of the brown allele is 1.0 - .45 = .55. The frequency of the heterozygous population is 2pq = 2 X .45 X .55 which is equal to .49.

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.