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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).
a black substance that coats the lungs of a smoker, causing cancer of the respiratory tract.
dormant, tough and non-reproductive structure that remains dormant until conditions become...
inter-connecting strands of cytoplasm that connect the cytoplasm of adjacent plant cells across...
an organic compound that always contains the elements carbon, hydrogen, oxygen and nitrogen and...