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Ch. 1 Lessons 1-3

TermDefinition
Organism a living thing
Habitat an environment that provides the things a specific organism needs to grow, live, and reproduce
Biotic Factor a living or once living part of an organism's habitat
Abiotic Factor a nonliving part of an organism's habitat
Species a group of similar organisms that can mate with each other and produce offspring that can also mate and reproduce
Population all the members of one species living in the same area
Community all the different populations that live together in a particular area
Ecosystem the community of organisms that live together in a certain area, along with their nonliving environment
Ecology the study of how organisms interact with each other and their environment
Birth Rate the number of births per 1,000 individuals for a certain time period
Death Rate the number of deaths per 1,000 individuals for a certain time period
Immigration movement of individuals into a population's area
Emigration movement of individuals out of a population's area
Population Density the number of individuals in an area of a specific size
Limiting Factor an environmental factor that courses a population to decrease in size
Carrying Capacity the largest population that a particular environment can support
Natural Selection the process by which organisms that are best adapted to their own environment are most likely to survive and reproduce
Adaptation an inherited behavior or physical characteristic that helps an organism survive and reproduce in its environment
Niche how an organism makes its living and interacts with the biotic and abiotic factors in its habitat
Competition the struggle between organisms to survive as they attempt to use the same limited resources in the same place at the same time
Predation an interaction in which one organism kills another for food or nutrients
Predator the organism that does the killing in a predation interaction
Prey an organism that is killed and eaten by another organism in a predation interaction
Symbiosis any relationship in which two species live closely together and that benefits at least one of the species
Mutualism a type of symbiosis in which both species benefit from living together
Commensalism a type of symbiosis between two species in which one species benefits and the other is neither helped nor harmed
Parasitism a type of symbiosis in which one organism lives with, on, or in a host and harms it
Parasite an organism that benefits from living with, on, or in a host in a parasitism interaction
Host an organism that a parasite live with, in, or on, and provides a source of energy or a suitable environment for the parasite to live
Created by: user-1975079
 

 



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