Final answer:
Biomagnification is the increasing concentration of toxic substances in organisms at higher trophic levels, exemplified by DDT impacting bald eagles.
Explanation:
Biomagnification is the process where toxic substances increase along trophic levels of an ecosystem, accumulating in organisms at each level. This phenomenon, exemplified by the case of DDT affecting bald eagles, showcases how harmful substances concentrate in higher trophic levels, posing risks to top consumers.
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