A gas present in air, produced in combustion, fermentation
and animal metabolism. Carbon dioxide is produced when any form
of carbon or almost any carbon compound is burned in an excess
In animal respiration carbon dioxide combines with haemoglobin
in red blood cells, is carried to the lungs and is breathed
out. Green vegetation uses chlorophyll to combine carbon dioxide
with hydrogen to form carbohydrates (photosynthesis).
Typical products include fizzy drinks, carton fruit juice,