Final answer:
Biomagnification is the process whereby toxic substances increase along trophic levels of an ecosystem.
Step-by-step explanation:
The term that best matches the description is biomagnification. Biomagnification is the process whereby toxic substances increase along trophic levels of an ecosystem. This occurs because predators at higher trophic levels consume prey that are contaminated with these substances, causing the concentration to increase as it moves up the food chain. A well-known example is the accumulation of the pesticide DDT in birds, which caused adverse effects on their populations.