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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.
an individual who receives a donated organ.
a chemical messenger produced and released by a cell or a gland in one part of the body of the...
the breaking down of large, complex food particles into smaller, soluble molecules which can be...
to make an action or process easy or easier.
the excessive growth of algae in eutrophic streams, rivers and dams.