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a measure showing the number of dependents (aged 0-14 and over the age of 65) to the total population (aged 15-64).
an atom or a group of atoms that has gained or lost one or more electrons and so has an electric...
involuntary muscle found in the walls of blood vessels, in digestive, respiratory, urinary and...
the hormone produced by the beta cells of the Islets of Langerhans in the pancreas, which...
when a person uses their breath to help another person who has stopped breathing, in an attempt...
the spread of cancer cells from the original (primary) malignant tumour to other parts of the...