Presentation and question about oxygen
First of all, I would like to say: hello everybody and thank you for your help!!..
My name is Miguel and I am writing from Spain. I would like to make a simple question. As you know, in the air there is 20% of oxygen (approximately), so, how much is the minimum oxygen needed by the human body to not suffocate?. Maybe, 10%, 5% or 2%?
Thank you. :)
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