Biological magnification refers to the process where certain substances, particularly toxins or pollutants, increase in concentration as they move up the food chain. Organisms at higher trophic levels accumulate these harmful substances more than those at lower levels due to their consumption of many prey items that each contain low levels of the toxin. This accumulation can lead to severe health consequences for top predators, including humans. Understanding biological magnification highlights the importance of monitoring and regulating harmful substances in the environment.