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What gas, making up approximately 21% of the Earth's atmosphere, is essential for the respiration of most living organisms?a)Nitrogenb)Oxygenc)Argond)Carbon dioxideCorrect answer is option 'B'. Can you explain this answer? for Class 7 2024 is part of Class 7 preparation. The Question and answers have been prepared according to the Class 7 exam syllabus. Information about What gas, making up approximately 21% of the Earth's atmosphere, is essential for the respiration of most living organisms?a)Nitrogenb)Oxygenc)Argond)Carbon dioxideCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 7 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What gas, making up approximately 21% of the Earth's atmosphere, is essential for the respiration of most living organisms?a)Nitrogenb)Oxygenc)Argond)Carbon dioxideCorrect answer is option 'B'. Can you explain this answer?.

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