List two forms of oxygen found in the atmosphere.name the process(s) by which: a) oxygen from the atmosphere is used up.
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oxygen is form by plant and by photo autotrophic
by photosynthesis. and use by animals ; plant in respiration o2 use in burning as o2 support burning.
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by photosynthesis. and use by animals ; plant in respiration o2 use in burning as o2 support burning.
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