2007-02-03 07:14:12 · 2 answers · asked by kevin g 1 in Environment
Life can exist without any oxegen completely. The same is true with oxygen as a gas. What we call Higher life, cannot exist without it. But single celled organisms can do very well without it.
Mammals have a hard time breathing when oxygen levels go below 13% Birds and lizards have a different lung structure and can go much lower that this, but I don't have the exact percentages for these animals.
2007-02-03 07:18:26 · answer #1 · answered by whatotherway 7 · 0⤊ 0⤋
Hi again, Kevin. Human life needs an absolute minimum of 8.5% oxygen to survive. It's interesting to note that in some large metropolitan areas, the oxygen level has been measured at just over 10% on bad days. That's kind of scary. Have a nice day.
2007-02-03 07:40:34 · answer #2 · answered by Dorothy and Toto 5 · 0⤊ 0⤋