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cahpter 2 vocabulary

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Question
Answer
what is doubling time   amount of time it takes for a population to double  
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what is a census   people who gather data on the population every ten years  
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what is sex ratio   # of males per 100 females in a population  
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what is a population pyramid   bargraph showng age and gender of people in a population  
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what is Zero Population Growth (ZPG)   NIR reaches zero  
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in what stage does the medical revolution take place   stage 2  
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what is demographic transition   change in population in an area through a process  
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life expectency   # of years a baby is expected to live  
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what is IMR   yearly number of babies under 1 who die  
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what is physiological density   # of people that can live on a piece of arable land  
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