送交者: AI 于 2005-3-17, 14:44:41:
回答: biology systems are dealing with complexity 由 xh 于 2005-3-17, 14:17:01:
Our body gains energy from food. The compounds carries energy has high energy potentials and the energy need to be released per the principle. Only oxygen can make the release happening. Then the compounds are oxidized and energy is released and used in our body.