Birth rate - Number of babies born per 1000 of the population, Death rate - Number of deaths per 1000 of the population, Migrant - Someone who moves, Push factor - Something that makes you want to leave where you are, Pull factor - Something that attracts you to a new destination, Ageing population - A population with a higher proportion of older people, Infant mortality  - The number of children under the age of one who die, per 1,000 per year., Fertility rate - The number of children a woman will have, on average, in each country., Population distribution - How people are spread out in an area. There may be a dense population or a sparse population., Sparsely populated - A low amount of people per km2. , Densely populated - A high amount of people per km2., Life expectancy - The average age a person is expected to live to, measured in years., Per 1,000 per year - Birth, death and infant mortality are measured in this unit, Per km2 - Population density is measured in this unit, Years - Life expectancy is measured in this unit,

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