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Which of the following is the best example of environmental remediation? (A) A species of trout becomes extinct in a eutrophic lake. (B) The annual volume of sewage flowing into a stream is decreased by one half. (C) The height of a factory smokestack is increased. (D) A parcel of forest land is declared a state park. (E) PCB-consuming bacteria are sprayed on an area that has soil contaminated with PCBs

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Harold

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Answer

E. PCB-consuming bacteria are sprayed on an area that has soil contaminated with PCBs

Explanation

Environmental remediation focuses on removing pollution or contaminants from the environment. Of the above choices, introducing PCB-consuming bacteria directly addresses the presence of a contaminant (PCBs) in the soil with the goal of breaking them down. Let's look at why the other options are not the best examples:* **A** describes an extinction event, not remediation.* **B** is a positive step in reducing pollution but doesn't actively remove existing sewage.* **C** might disperse pollution over a wider area but doesn't reduce it.* **D** conserves land but doesn't inherently remediate existing damage.

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