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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 water that is found underground in soil pore spaces and in the cracks and spaces within rock...
cells that are formed during secondary growth by the vascular cambium ring just to the outside...
all the chemical reactions involved in maintaining the living state of the cells and the...
a molecule that stores large amounts of energy that can be used for metabolic activity.