Thoroughly dried dead plant material is 44.4 percent oxygen by weight. How is this oxygen held in the plant so that it doesn't escape into the atmosphere?
A) This oxygen is held within cellulose micropores of the plant tissue.
B) This oxygen is found mostly as carbon dioxide, which is heavier than air.
C) This oxygen is not gaseous 
, but oxygen atoms bound to the cellulose structure.
D) Plants fix this oxygen during photosynthesis.
Correct Answer:
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