That's explained in this video coming up. VOICEOVER: Anaerobic respiration in micro-organisms. All living cells respire. It's the process that releases the energy stored in glucose for life ...

The glucose can also be broken down in the plant by respiration. close respirationA ... Photosynthesis is important to living organisms because it is the number one source of oxygen in the atmosphere.

The rise of oxygen levels led to the evolution of aerobic respiration, a process that uses oxygen to convert food into energy. Today, most land and aquatic organisms – including humans – need ...

"It may be drawing it from the surrounding fish cells, or it may have a different type of respiration such as oxygen-free breathing, which typically characterizes anaerobic non-animal organisms." ...

Then, via respiration processes ... fuels we use to power our world today are the ancient remains of once-living organisms, and they provide a dramatic example of this cycle at work.