The correct answer is "bioremediation." Bioremediation refers to the use of bacteria, along with other microorganisms, to degrade or detoxify pollutants in the environment. It is a natural and environmentally friendly approach that harnesses the metabolic capabilities of bacteria to break down various pollutants, including organic contaminants, oil spills, heavy metals, and other toxic substances. Through bioremediation, bacteria play a crucial role in the removal and transformation of pollutants, helping to restore contaminated environments.