Groundwater comes from underground reservoirs called aquifers____ and we rely on these sources to meet half of our water needs in the United States should there be a comma in the blank or should it be

Groundwater comes from underground reservoirs called aquifers____ and we rely on these sources to meet half of our water needs in the United States

should there be a comma in the blank or should it be like it is with no comma?

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Groundwater comes from underground reservoirs called aquifers____ and we rely on these sources to meet half of our water needs in the United States should there be a comma in th…

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