These are often known as the 'lungs of the world' because they produce oxygen.

The flow of current through the water produced hydrogen and oxygen.

Once plants spread across Mars, they would start producing oxygen.

It will produce oxygen for 12 to 22 minutes.

Without the oxygen produced from water by green plants, life as we know it on this planet would be impossible.

Imagine if we could understand how algae produce oxygen from sunlight.

The green algae blooms support the fish as food and produce oxygen.

Forests also produce oxygen at a rate higher than will any form of vegetation replacing them.

They were the first organisms to produce free oxygen by photosynthesis.

The snow also deprives the water of light, which means that the plants cannot produce oxygen.