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Grade 8 Ch E2

Science Explorer Environmental Science Ch 2

biotic factor a living (or once living) part of an organisms’ habitat
abiotic factor a nonliving part of an organism’s habitat
population all the members of one species in a particular area
community all the different populations that live together in an area
ecology the study of how living things interact with each other and their environment
immigration entering a population
emigration leaving a population
population density the number of individuals in an area of a specific size
limiting factor an environmental factor that causes a population to decrease
carrying capacity the largest population that an area can support
symbiosis a close relationship between two species that benefits at least one of the species
mutualism a relationship between two species in which both species benefits
commensalism a relationship between two species in which one species benefits and the other is neither helped nor harmed
parasitism a relationship in which one organism lives on or in a host and harms it
primary succession the series of changes that occur in an area where no soil or organisms exist
pioneer species the first species to populate an area
secondary succession the series of changes that occur in an area where the ecosystem has been disturbed but where soil and organisms still exist
Created by: DawnSimpson