When looking for sources to examine farmers' usage of DDT and its impact on the bird population, Hakeem should look at the farmers' bird population.
DDT was employed on a wide range of food crops in the U.S. and around the world. DDT was widely utilized because it is effective, very affordable to produce, and has a long shelf life in the environment. DDT was also employed to control pests in buildings.
Hakeem should look at the farmers' bird population when looking for sources to investigate farmers' use of DDT and its impact on the bird population. When it comes to the bird population, it is affected by the use of DDT.
Therefore, option b is correct.
Learn more about the Dichlorodiphenyltrichloroethane, refer to:
https://brainly.com/question/16048930
#SPJ1