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### 24 Cards in this Set

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 Birth rate the number of births occurring during a period of time death rate or mortality rate the number of deaths in a period of time life expectancy how long on average an individual is expected to live dispersion is the spatial distribution of individuals within the population population density measures how crowded a population is properties of populations 1. population size 2. populations density 3. dispersion age structure the distribution of individuals among different ages in a population survivorship curves the graph of a species mortality rate data growth rate of a population as the amount by which a populations size changes in a given time immigration is the movement of individuals into a populatoin emigration is the movement of individuals out of the population exponential model of population growth dewscribes a population that increases rapidly after only a few generations exponential growth the larger the population gets the faster is grows Limiting factor a factor that restrains the growth of a population logistic model of population growth builds on the exponential model but accounts for the influence of limiting factors carry capacity the number of individuals the environment can support over a long period of time logistic growth a model of population growth in which birth and death rates vary with population size and are weual at the carrying capacity density independent factors a variable that affects populatoin size regardless of population density EX:weather, floods, fires Density dependent factors a variable related to the density of a population that affects population size EX:shortage of food, nesting sites inbreeding mating with relatives hunter-gatherer lyfestyle a nomadic way of life in which food is found by hunting animals and gathering uncultivated plants, fruits and shellfish agricultural revolutions led to profound changes in every aspect of life developed countries includes all of the worlds modern industrialized countries such as us japan germany france,uk, australia, canada, and russia developing countries a category that includes most countries in asia and all of the countries in central america, south america, and africa...these countries are poorer