Crude Death Rate-  # of deaths per 1000 of the population 
Crude Birth Rate- # of births per 1000 of the population
Net Migration Rate- the difference between the number of persons entering and leaving a  country is net immigration 
Rate of Natural Increase- produced by the death rate from the birth rate the gives the
gives us the annual natural growth rate- in % FORM FOR A COUNTRY 
Life Expectancy- average # of years to be lived by by a group of people born in the same year
 
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