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compounds such as lipids, carbohydrates, proteins, nucleic acids, vitamins, petrochemicals and some plastics that contain the elements carbon and hydrogen.
simple connective tissue with a network of white, inelastic, collagen fibres and small, yellow,...
a United Nations treaty that was drawn up during a meeting of countries in Japan in 1997. It...
animal wastes (particularly urine) that contain materials high in nitrogen.
a ring of muscle that controls the passage of substances through a tube or body opening.
a form of malnutrition caused by a severe shortage of protein in the diet.