Blue's for oxygen, which we don't see now, because there's none in there yet.

It's probably not meeting his needs for oxygen to the brain, let alone creative, free play.

He can survive in space without the need for oxygen.

Eating can increase the body's demand for oxygen, so you'll need it.

This is a source of O2, certainly, but it doesn't easily account for so much oxygen.

I kept sucking in air, fighting for oxygen, but nothing came out.

Learn about how to make a 3-D model for oxygen in this article.

Scientists always look for oxygen and water to see if there are living things in space.

I asked when she paused to come up for oxygen.

Those are absorption lines for oxygen and water, here, aren't they?