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I. How Populations grow
A. Describing populations
1. Geographic Range-
Space where it lives
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2. Density-# of individuals of a speciesper unit area
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3. Distribution-shows how organisms are spreadacross their range
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4. Growth Rate- tells whether a population isgetting bigger, smaller or staying the same
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5. Age structure-#s of males and females in different age groups of a population
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B. Population Growth-changes based onhow many individuals are added or removed
1. How?
a. Birthrate/death rate
b. immigration/emigration
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C.Exponential Growth-the larger a populationgrows, the more quickly it grows—graph looks likea J
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D.Logistic growth-a growth pattern in which aPopulation’s growth rate slows down or stopsfollowing a period of exponential growth---graph shaped Like an S
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E. Carrying Capacity1) the greatest number of individuals an
Environment can support2) the degree to which a population is
limited in size by its resources
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II. Limits to Growth
A. Limiting Factors
Anything that causes the growthOf a population to decrease
Ex: food, predators
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1. Density-Dependent Limiting factors
a. Depends on population size
1. predator-prey cycle
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3. Parasites and disease
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2. Density Independent Factors
Affects populations regardless of size
Ex: weather , natural disasters
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III. Human Population growth
A. Historical Overview
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B. Patterns of Human population Growth
1. Demography - the scientific study of human populations
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2. Demographic Transition-
A change from high birth rates and death rates to low birthrates and death rates
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4. Future Population growth