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IGHS Winkels
Biology Chapter 5
| Term | Definition |
|---|---|
| Population Density | the number of individuals per unit area |
| Immigration | the movement of individuals into an area |
| Emmigration | the movement of individuals out of an area |
| Exponential growth | occurs when the individuals in a population reproduce at a constant rate |
| Logistic growth | occurs when a population's growth slows or stops following a period of exponential growth |
| Carrying capacity | the largest number of individuals that a given environment can support |
| Limiting factor | a factor that causes population growth to decrease |
| Density-dependent limiting factor | a limiting factor that depends on population size |
| Predator-prey relationship | one animal kills another animal for food |
| Density-independent limiting factors | Ex. unusual weather, natural disasters, seasonal cycles, and certain human activities such as damming rivers affect everyone |
| Demography | the scientific study of human populations |
| Demographic transition | a dramatic change in birth and death rates |
| Age-structure diagrams | show the population of a country broken down by gender and age group |
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Winkels
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