Final answer:
Biomagnification is the process whereby toxic substances increase along trophic levels of an ecosystem.
Step-by-step explanation:
Biomagnification is the process whereby toxic substances increase along trophic levels of an ecosystem. This means that as you move up the food chain or web, the concentration of these substances becomes higher in each organism. Biomagnification can occur with substances such as pesticides like DDT and other chemicals like PCBs and heavy metals.