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chapter 1

populations and Communities

organism a living thing
habitat an enivrement that provides the things the organism needs to live ,grow,and reproduce.
biotic factor a living part of an organism's habitat.
abiotic a nonliving part of an organisms habitat
photosyithesis the process in which organisms use water along with sunlight and carbon dioxide to make their own food.
Species A group of organisms that are physically similar and can mate with each other and produce offspring that can also mate and reproduce.
population All the members of one species in a particular area.
community All the differnt populations that live together in an area.
ecology the study of how living things interact with each other and their environment.
estimate Is an approximation of a number, based on responsible assumptions.
birth rate Of a population is a number of births in a population in a certian amount of time.
Death rate The number of deaths in a population in a certian amount of time.
Immigration Moving into a population.
Emmigration Moving out of a population.
population density The number of individuals in an area of a specific size.
Limiting factors is an enviromental factor that causes a population to decrease.
carrying capacity the largest populations that an area can support.
natural selection a charactaristic that makes an individual better suited to its environment tha may eventually become common in that species through a process.
adoptions the behaviors and physical charactaristics that allow organisims to live successfully in their environment.
niche the role of an organism in its habitat, or how it makes its living.
competition the struggle between organisims to survive as they attempt to use the same limited resource.
predation An interaction in which one organism does the killing, in food.
Preditor The organism that does the killing in this case the Tigershark is the preditor.
Prey the organism that is killed in this case the Albatros is the prey.
Symbiosis In a close relationship between two species that benefits at least one of the species.
mutuatiasm a relationship in which both species benefit.
commensatism a relationship in which one species benefits and the other species is neither helped nor harmed.
parasite involves one organism living on or inside another organism and harming it. The organism that benefits.
parasitism involves one organism living on or inside anohter oranism and harming it.
Host the organism that is lives on or in.
succession the series of predictable changes that occur in and over time.
primary succession is the series of changes that occur in an area where no soil or organisms exist.
pioneer species the first species to populate the area.
Secondary succession is the series of changes that occur in an area where the ecosystem has been disturbed.
Created by: ljudd