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Doctors Medicines MCQs Q&A

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(a) found (b) used/utilized (c) filled (d) but (e) comprise/make/form

Scientists have (a) found out that Hydrogen can be (b)used/utilized as renewable energy source. The nature is (c)  filled with Hydrogen  (d) but it does not exist separately as gas. Hydrogen and Oxygen (e) comprise/make/form water.

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