But it was air with enough oxygen to support life.

With so little oxygen, they would not have lived long.

Usually the reaction of some material with oxygen in the air.

I was still breathing hard, trying to clear my head with oxygen.

The air was heavy with oxygen all around him and this helped his human senses.

This one is without an ocean and with very little oxygen in the atmosphere.

Traveling with oxygen can be done if you plan ahead.

Climbing with oxygen for the first time in my life, I took a while to get used to it.

Although they can live in water with high oxygen, this makes them move slower.

It also cannot live for too long in an environment that is rich with oxygen.