Biomagnification is highest in

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(D) Biomagnification refers to the increase in concentration of non-biodegradable substances (like $DDT$,mercury,etc.) at successive trophic levels in

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Top carnivores

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(D) Biomagnification refers to the increase in concentration of non-biodegradable substances (like $DDT$,mercury,etc.) at successive trophic levels in a food chain.Since these substances are fat-soluble and cannot be metabolized or excreted,they accumulate in the fatty tissues of organisms.As energy and matter move up the food chain,the concentration of these toxic substances increases significantly.Therefore,the highest concentration of these pollutants is found in the top carnivores (or tertiary consumers) of the food chain.

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