Why can't we breathe pure oxygen?
Answer:
Breathing pure oxygen over a period of time may lead to serious lung irritation. And, breathing pure oxygen at pressures greater than 1 atmosphere can lead to fatal consequences.
ref: http://www.deep-six.com/page79.htm...
It would be too concentrated for our bodies to handle.
Our bodies can't handle that much oxygen because it is simply just too much. That is why the atmosphere is only made up of about 23 or 22 % oxygen. The rest is hydrogen, and nitrogen, etc.
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