Pollution from fertilisers, pesticides and toxic chemicals from factories gets into the environment, Small invertebrates get exposed to pollution, The Secondary consumer eat the invertebrate , The tertiary consumer eats prey which has even more pollution in it, Humans fish for food and catch fish which have even higher levels of pollution in it, The concentration of toxic chemicals starts off small, The concentration of toxic chemicals builds as you go up the food chain.

Bioaccumulation

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