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Line 8: − [[Category:Chemistry]] − [[Category:Elements]] − +
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Many [[animal]]s depend upon oxygen as a highly efficient ingredient for breaking down [[food]] for [[energy]], due to its reactivity. Those that do not are called "[[anaerobic]]", meaning "without air", and include many important [[bacteria]].
Many [[animal]]s depend upon oxygen as a highly efficient ingredient for breaking down [[food]] for [[energy]], due to its reactivity. Those that do not are called "[[anaerobic]]", meaning "without air", and include many important [[bacteria]].
[[Category: hydrogen economy]]
[[Category: hydrogen economy]]
[[Category:gasses]]
[[Category:gases]]