Biomagnification is the process by which certain substances, like pesticides or heavy metals, become more concentrated in the tissues of organisms as they move up the food chain. When small organisms absorb these harmful substances from their environment, they are consumed by larger predators. As each predator eats multiple smaller organisms, the concentration of these toxins increases in their bodies. This phenomenon can have serious effects on ecosystems and human health. For example, fish in polluted waters may accumulate high levels of mercury, which can then be passed on to larger animals, including humans who consume them. This can lead to health issues, particularly in vulnerable populations.