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Chapter 4 Vocabulary
Straughn 9th Grade Honors Biology
| Question | Answer |
|---|---|
| population density | number of organisms per unit of living area |
| dispersion | arrangement of a population in its environment |
| density-independent factor | environmental factor, such as storms and extreme heat or cold that affects populations regardless of their density |
| density-dependent factor | environmental factor, such as predation, disease, and competition, that depends on the number of members in a population per unit area |
| population growth rate | how fast a specific population grows |
| emigration | movement of individuals away from a population |
| immigration | movement of individuals into a population |
| carrying capacity | largest number of individuals of a particular species that a particular environment can support long-term |
| demography | study of human populations based on size, density, movement, distribution, and birth and death rates |
| demographic transition | population change from high birth rates and death rates to low birth rates and death rates |
| zero population growth | occurs when the birth rate equals the death rate |
| age structure | in any population, the number of individuals in their pre-reproductive, reproductive and post-reproductive years |
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