Respiration 2 bya
There was another way that could survive the . created waste products, such as and . By letting slowly burn these some could make the oxygen safe. They survived. We call them aerobic bacteria, or just aerobes.
They not only survived but prospered. Burning releases . The aerobes had discovered a new energy source! Aerobes could get more energy out of their food than , and they quickly became the commonest . So oxygen became a help instead of a poison.
A cell obtains energy by respiration
The burning process is called respiration. If you compare this diagram with the one for you should see that the energy which is released by respiration had originally come from the . This is why the Sun is so very important for . It supplies almost all the energy used by living things, whether bacteria, plants or animals.
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