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multiple interacting species that live in the same area


number of individuals within a population per unit area

population density

stabilizes a population at its carrying capacity

environmental resistance

species occurring in only one area


a population is a

group of individuals of a single species that live in one area

high population density can

increase the incidence of disease transmission

the carrying capacity is the

maximum population size that a given environment can sustain

density dependent factors

include the effects of disease and predators on a single species within a community

a population that is limited by a resource is expected to have an exponential growth curve


An example of a density independent factor would be

cold weather causing the lake to freeze

A cumber of coyotes move into an area and begin to ear a population of small harvest mice. After several years, the harvest mice are much speedier runners than before the coyotes came. This is an example of

directional selection

Lifestyle changes brought about by ___ and ____ have decreased the economic need for children?

Industrialization and urbanization

the human population is approximately

6.7 billion

Declining death rates due to increased food production and improved medical care while birth rates remain high is characteristic of the _______ stage?


Which of the following factors drives TFR down?

social and economic security

According to the IPAT model, technology that enhances our acquisition of minerals, fossil fuels, timber, and ocean fish

Increases environmental impact

The Cornucopian view held by many economists suggests that resource depletion due to greater number of people

Is not a problem if new resources can be found to replace depleted ones

The sensitivity factor in the model used to represent human environmental impact denotes

the sensitivity of an environmental to human pressures

if growth rate of a given area is steady, population size will soon stabilize


poorer societies have lower birth rates than more affluent societies


Presently over 80% of the world's population lives in developing nations


the number of people per household is rising rapidly in the US and Great Britain


as of 2008, TFR is highest in Europe and lowest in Africa


Humus is

composed of organic compounds and is necessary for fertile soils and for holding soil moisture


removes nutrients from soil

the loss of more than 10% productivity in arid areas due to erosion, soil compaction, forest removal, and an array of other factors is called


The US agency charged with slowing soil degradation is the

Natural Resources Conservation Service

Shelterbelts are to _____ as terraces are to ______

wind erosion; water erosion

The buildup of salts in soils as a result of overirrigation is


The consequences of overfertilization can include

eutrophication in nearby waters

what is the basis for soil textural determinations?

particular size

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