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Which of the following compounds does not get degraded under any circumstances?

Which of the following compounds does not get degraded under any circumstances? Correct Answer Recalcitrant

Recalcitrant is the term used for the compounds that are persistent in the environment for a long time as it cannot be degraded under any circumstances. Whereas, Mineralization and Bioaccumulation various process in the environment. And Persistent is not degraded, it persists in the environment.

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The compounds which does not get degraded under any circumstances is called _______
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