Notice the population of beetles. the allele for color is seen on their backs: green and brown alleles. over time, through random chance, the gene pool of the beetle population changes. eventually the gene pool contains only green alleles. this is an example of a) gene flow. b) adaptation. c) genetic drift. d) natural selection.\

D natural selection

Explanation:

Natural selection can be define as the phenomena of differential survival and reproduction of organisms who possess better phenotypic traits. According to the given situation, the two allele colors of the beetles like brown and green. The population would likely to have gene pool of green beetles in future. This is due to the fact that they have green color as a phenotypic trait, which prevent their detection by the predators in grass. These bettles will survive and reproduce.

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.