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Chapter 21

Vocabulary

TermDefinition
biosphere the parts of Earth and the surrounding atmosphere where there is life
community all the populations of different species that live together in the same area at the same time
population all the organisms of the same species that live in the same area at the same time
competition the demand for resources suck as food and water and shelter in short supply in a community
limiting factor anything the restricts the size of a population
population density the size of a population compared to the amount of space available
biotic potential the potential growth of a population if it could grow in perfect conditions with no limiting factors
carrying capacity the largest number of individuals of one species that an environment can support
birthrate the number of offspring produced of a given time period
death rate the number of individuals that die over the same time period
extinct species a species that had died out and no individuals are left
endangered species a species whose population is at risk of extinction
threatened species a species at risk but not yet endangered
migration the instinctive seasonal movement of a population of organisms from one place to another
habitat the place within an ecosystem where an organism lives
niche what a species does in its habitat to survive
producers organisms that get energy from the environment
consumers organisms that get energy by eating other organisms
symbiosis long term relationship between two species that usually an exchange of food and eneergy
mutualism a symbiotic relationship in which both partners benfit
commensalism a symbiotic relationship that befits one species but does not harm or benefit the other
parasitism a symbiotic relationship that benefits species and harms the other
Created by: Eva L.
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