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a substance found in certain fatty foods or manufactured in the liver. High levels of cholesterol in the blood are thought to be linked to heart disease.
the use of modern technology to manipulate living organisms to obtain products from them that...
extremely hard, calcium-rich substance which covers the crown of the tooth.
a hormone that causes the secretion of gastric juices into the stomach.
allergic reaction to certain allergens such as pollen. It causes sneezing, a runny nose and...