Population Sizes
The organisms of the same species that live in the same area at the same time.
What is population?
page: 742
The number of individuals that die over the same time period.
What is death rate?
page: 749
Affected by the same three factors that determine the sizes of all populations-birthrate, death rate and movement.
What is human population size?
page: 753
Made up of all the species that live in the same ecosystem at the same time.
What is community?
page: 759
Interacts with each other in a variety of ways.
What is relationships in communities?
page: 762
One way of estimating population density
What is sample count?
page: 744
A population is in ideal conditions with unlimited resources.
What is exponential growth?
page: 750
Fossil fuels, cloth, foods, and Many other materials are easily transported around the world by planes, trains, trucks, or boats.
What is resources?
page: 754
The place within an ecosystem where an organism lives.
What is a habitat?
page: 759
Often captures weak or injured individuals of prey population.
What is predators?
page: 762
The size of a population becomes larger than the carrying capacity of its ecosystem.
What is overpopulation?
page: 745
A species that has died out and no individuals are left.
What is extinct species?
page: 751
As recently as 100 years ago, diseases such as typhoid, cholera, and diphtheria were major causes of death.
What is sanitation?
page: 754
A species does in a habitat to survive.
What is niche?
page: 759
The members of some populations work together for their survival.
What is cooperative relationships?
page: 763
Available water, food, shelter, sunlight, and temperature, are possible limiting factors for a population.
What are environmental factors?
page: 743
A species whose population is at risk of extinction.
What is endangered species?
page: 751
Diseases like AIDS and malaria cause high death rates in some countries.
What is human population size decrease?
page: 755
Organisms that get energy from the environment, such as sunlight, and make their own food.
What is producers?
page: 760
A symbiotic relationship in which both partners benefit.
What is mutualism?
page: 763
Disease, space, predators, and food are some of the factors that limit
What is carrying capacity?
page: 745
A place becomes overcrowded, individuals might move to find more living space
What is movement?
page: 752
The size of a human population Changes as people move from place to place.
What is population movement?
page: 755
Organisms that get energy by eating other organisms.
What is consumers?
page: 760
A symbiotic relationship that benefits one species but does not harm or benefit the other.
What is commensalism?
page: 764