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chapter 1

populations and communities

QuestionAnswer
organism a living thing
habitat An environment that provides the things that the organisim needs to live grow and reproduce.
biotic factors the living parts of a habitat
abiotic factors the nonliving parts of an organisms habitat
photosynthesis the process in witch plants and algae make food using water and carbon dioxide
species a group of animals that are closely related
ecology the study of how living things interact with each other and their own environment
estimate an approximation of a number based on reasonable assumption
population all the members of one species in a particular area
community all the populations in an area
ecosystem the community of organisms that live in a particular area along with their nonliving surroundings
birth rate the number of births in a certain amount of time
death rate the number of deaths in a certain amount of time
immigration means moving into a population
emigration means moving out of a population
population density the number of individuals in an area of a specific species
natural selection individuals that have uniqe characteristics are beat suited for their environment tend to survive and produce an offspring
adaptions the behaviors and physical characteristics that allow organisms to live successfully in their environment
natural selection individuals that have uniqe characteristics are best suited for their environment tend to survive and produce offspring.
adaptations the behaviors and physical characteristics that allow organisms to live succsesfully 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 attemt to use the same limited resource
predation an interaction in witch one organisim kills another for food
predator the organism that does the killing
prey the organism that is killed
symbiosis a close relationship between two species that benifits at least one of the species
mutualisim a relationship in witch both species benifit
commensalisim a relationship in witch one species benefits and the other in neither helped or harmed
parasitisim involves one organisim living on or inside of another organism
parasite the organism that benifits
host the organisim that the parasite lives on
Created by: nkellogg