species cluster where resources are availabe, groups have a better chance of finding resources
1.Produce many, small offsprings, provide little or no parental protection
2.Few offsprings, mature slowly and have a life span, are cured for by one or both parents.
human population growth
increased due to ability to expand in all climate zones, agriculture allows more food production,and improved health care( this decreased the death rate)
cultural carrying capacity
maximum number of people that can be supported at a reasonble level of comfort without effecting the future generation.
infant morality rates
female health, access to healthy food, better nuitrition, safe water supplies helped increase the new born.
the number of % of males and females in each age groups, indicate rate of population growth.
Family planning -slowing population-
provides educational and clinical services that help couples choose how many children to have and when to have them
Economic development -slowing population-
as countries become more industralized the population decreases
unsustainable, 25 of land is occupied tget consume about 75% of its resources, and produce 75% of the world's climate changing carbon dioxide.
lack of vegetation
vegetation can abosrb air pollution, where trees are destroyed in order to make buildings, roads, parking lots,
water issues in cities
deeper wells must be drilled so this causes, flooding, deplete underground water supplies, global warming reduces the glaciers that melt each year
Pollution in cities
produced in smaller areas and cannot be dispersed , increase infectious dieseases
one way to encourage more environmentally sustainable development that requires less dependence on cars, controls and directs sprawl, and reduces wasteful resource use.
the number of people living per unit of an area (e.g. per square mile); the number of people relative to the space occupied by them
migration from a place (especially migration from your native country in order to settle in another). Leaving a country
The resistance presented by the environmental conditions to limit a species from growing out of control or to stop them from reproducing at maximum rate.
Population growth in which the growth rate decreases with increasing number of individuals until it becomes zero when the population reaches a maximum.
Growth whose rate becomes ever more rapid in proportion to the growing total number or size
Density independent factor
A factor that affects the size of a population independent or regardless of the population density.