像 DDT 和汞这样有负面影响的物质是有毒的。很难预测有毒物质将会给生态系统造成怎样的影响。例如,当下雨的时候,水流可以将有毒物质从田地冲刷到附近的水系统中。这可能通过生物富集效应影响一个全新的生态系统。

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