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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).
the part of the atmosphere that contains the ozone layer and is about 10 km above the Earth's...
an organic compound that always contains the elements carbon, hydrogen, oxygen and nitrogen and...
small fluid-filled spaces in the matrix of bone and cartilage in which cartilage and bone cells...
a small finger-like projection found on the inner folds of the small intestine, which increases...
tumours in the lung tissue that interfere with the normal functioning of the lungs.