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Explanation: The verb "enrich" means to enhance or improve something by adding value, which does not fit the context of emphasizing a need. "Underscore" means to highlight or emphasize, which correctly conveys the idea that environmental challenges stress the importance of recalibrating water policies. "Enliven" means to make something more lively or spirited, which is incorrect here. "Refine" means to make improvements or adjustments, but it does not convey the idea of emphasizing a need. "No improvement is required" is incorrect because "enrich" does not fit well in this context.
When applying KVL to a circuit, how are voltage drops represented?
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Which command is used to display the contents of a file in a Unix/Linux system?
What is a top-down parser?
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