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Chapter 1

Populations and Communities

organism a living thing
habitat an environment that provides the things that an organism needs to live,grow,and reproduce
biotic factor the living parts of a habitat
abiotic factor the nonliving parts of a habitat
photosynthesis 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 the members of one species in a particular area
community all the different populations that live together in an area
ecosystem the community of organisms that live in a particular area, along with their nonliving surroundings
ecology the study of how living things interact with each other and the environment
estimate an approximation of a number, based on reasonable assumptions
birth rate the birth rate of a population is the number of births in a population in a certain amount of time
death rate the number of deaths in a population in a certain amount of time
immigration moving in to a population
emigration leaving a population
population density the number of individuals in an area of a specific time
limiting factor an environmental factor that causes a population to decrease
carrying capacity the largest population that an area can support
natural selection a characteristic that makes an individual better suited to it's environment may eventually become common in that species through a process called natural selection
adaptations the behaviors and physical characteristics that allow organisms to live successfully in their environments
niche the role of an organism in it's habitat , or how it makes it's living, is called niche
competition the struggle between organisms to survive as they attempt to use the same limited resource
predation an interaction in which one organism kills another for food
predator the organism that does the killing is the predator
prey the organism that is killed is the prey
symbiosis symbiosis is a close relationship between two species that benefits at least one of the species
mutualism the relationship in which both species benifit is called mutualism
commensalism a relationship in which one species benifits and the other species is neither helped nor harmed is called commensalism
parasitism involves one organism living on or inside another organism and harming it
parasite the organism that benifits is called a parasite
host the organism it lives on or in is called a host
succesion the series of predictable changes that occur in a community over time
primary succesion the series of changes that occur in an area where no soil or organisms exist
pioneer species the first species to populate the area are called pioneer species
secondary succesion the series of changes that occur in an area where the ecosystem has been disturbed, but where soil and organisms still exist
Created by: arank