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Questions and Answers
What is the percentage of oxygen in the air?
What is the percentage of oxygen in the air?
21%
How is the oxygen element circulated through the biosphere?
How is the oxygen element circulated through the biosphere?
Oxygen cycle
What process do human beings and animals take oxygen from the atmosphere?
What process do human beings and animals take oxygen from the atmosphere?
Respiration
What happens during the decomposition of dead organisms?
What happens during the decomposition of dead organisms?
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