The lack of which gas is the general cause of yawning?
Correct answer: Oxygen
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Tom
The struggle for breath, say when you are under water, is not lack of oxygen but build up carbon dioxide. Similar but not the same
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Cat Mom
bloggs, there are 4 answers to choose from. Unless you mean between needing more oxygen or less carbon dioxide
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bloggs
so both answers could be right, but maybe not !