Quotation from: General Science

Written by: Bertha M. Clark


Wood and coal, and in fact all animal and vegetable matter, contain
carbon, and when these substances burn or decay, the carbon in them
unites with oxygen and forms carbon dioxide.


The food which we eat is either animal or vegetable, and it is made
ready for bodily use by a slow process of burning within the body;
carbon dioxide accompanies this bodily burning of food just as it
accompanies the fires with which we are more familiar. The carbon
dioxide thus produced within the body escapes into the atmosphere with
the breath.

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