wolny tlen

Plants use the carbon dioxide and return free oxygen to the air.

For instance, there almost certainly was no free oxygen in the atmosphere.

After all, we live in a sea of free oxygen without damage.

The buildup of free oxygen is more likely to have been rather slow.

Flesh does not have the free oxygen necessary for Thread life.

For a spacecraft however, things become more complicated as there is no free oxygen in space.

The indicator tells whether the environment was indeed oxygen free or not.

Go a little farther back and find no free oxygen at all.

Replies: There was no free oxygen when life first appeared on earth.

We don't know how there can be any measurable amount of free oxygen.