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the number of births in a year.
the using up of goods and services
a number of deaths in a year
a porror country with less advanced economy
the length of time it takes for a population to double
a comunity of all living things in an area.
a severe shortige of food.
a recorce that can be used a lot.
an artificcal lake where water can be stored
a creation and use of tools to meet practical needs.
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