Water pollution affects the ecology and economy of an area. Biomagnification is the accumulation of a substance up the food chain by transfer of the pollutant in smaller organisms that are food for larger organisms in the chain. It generally refers to the sequence of processes which results in higher concentrations in organisms at higher levels in the food chain (at higher trophic levels). These processes result in an organism having higher concentrations of a substance than is present in that organism’s food. There is evidence that some carnivores at the ends of longer food chains (e.g. larger fish, birds of prey, humans) can then accumulate the water pollutant from eating down in the food chain.
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