Imagine a creature basking on a sun-warmed rock, its scales shimmering in the light, barely moving—yet, somehow, staying ...

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 ... Photosynthesis is important to living organisms because it is the number one source of oxygen in the atmosphere.