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a molecule that is formed when oxygen and haemoglobin combine chemically.
a hormone produced by the adrenal glands which helps to maintain the balance of sodium in the...
the trapping of the sun's heat energy by certain gases in the atmosphere, e.g. carbon dioxide...
also known as sodium hydrogen carbonate. It is a crystalline white solid that usually appears as...
a biological classification group (taxon) that is divided into families.
minerals and vitamins that are taken as nutritional supplements to regular food (in the form of...