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(D) The phenomenon where toxic substances like $DDT$ increase in concentration at each successive trophic level is known as biomagnification.In an aqu

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Fish-eating birds

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(D) The phenomenon where toxic substances like $DDT$ increase in concentration at each successive trophic level is known as biomagnification.In an aquatic food chain,$DDT$ enters the water and is absorbed by phytoplankton $(0.003 \ ppb)$.It then moves to zooplankton,small fish,and large fish,with concentrations increasing significantly.Finally,it reaches the highest concentration in fish-eating birds (top carnivores) due to their position at the end of the food chain,where it can reach levels as high as $25 \ ppm$.

In an aquatic food chain,the highest concentration of $DDT$ is found in which of the following?

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