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Science Ch 1 Vocab

Pearson Chapter 1 Vocabulary

TermDefinition
organism a living thing
habitat an environment that provides the things a specific organism needs to live, grow, and reproduce
biotic factors part of a habitat that are living or once living, and interact with an organism
abiotic factors the nonliving parts of an organism's habitat
population all the members of one species living in a particulary area
species a group of organisms that can mate with each other and produce offspring
community all the different populations that live in an area
ecosystem a community of organisms that live in a particular area, along with their nonliving environment
ecology the study of how organisms interact with each other and with their environment
birth rate the number of births per 1,000 individuals for a given time period
death rate the number of deaths per 1,000 individuals for a given time period
immigration moving into 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 stop growing or decrease in size
carrying capacity the largest population that an area can support
natural selection the process by which organisms that are best adapted to their environment are most likely to survive and reproduce
adaptations the behaviors and physical characteristics that allow organisms to live successfully in their environments
niche the role of an organism in its habitat
competition the struggle between organisms to survive as they attempt to use the same limited resources
predation an interaction where one organism kills another for food or nutrients
predator the organism that does the killing
prey the organism that is killed
symbiosis a relationship in which two species live closely together and at least one of the species benefits
mutualism a relationship in which both species living closely together benefit
commensalism a relationship in which one species benefits and the other species is neither helped nor harmed
parasitism a relationship that involves one organism living with, on, or inside another organism and harming it
parasite the organism that benefits in parasitism
host the organism the parasite lives on or in
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 a series of changes that occur in an area where the ecosystem has been disturbed, but where soil and organisms still exist
Created by: kstevenson
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