Flash Cards

Populations and Communities

Question Answer
organism a living thing
habitat an environment that provides the things the organism needs to live, grow, and reproduce
biotic factor the living parts of a habitat
abiotic factor the nonliving parts of a habitat
photosynthesis the process organisms using water and sunlight and carbon dioxide that make their food
species a group of organisms that are physically similar and can mate with each other and produce offspring that can mate and reproduce
community all the different populations that live together
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 their environment
estimate an approximation of a number based on reasonable assumptions
birth rate 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 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 decrease
carrying capacity the largest population that an are can support
natural selection a characteristic that makes an individual better suited to its environment may eventually become common in that species through this process
adaptations the behaviors and physical characteristics that allow organisms to live successfully in their environment
niche the role of an organism in its habitat or how it makes its living
competition the struggle between to organisms to survive as they attempt to use the same limited resource
predation the organism that does the killing
predator the organism that does the killing
prey the organism that gets killed
symbiosis a close relationship between two species that benefits at least one species
mutualism a relationship that benefits both species
commensalism a relationship in which one species benefits and the other species is neither helped nor harmed
parasite the organism that benefits from the parasite
host the organism that the parasite lives inside
succession the series of predictable changes that occur in a community over time
primary species the series of changes that occur in an area where there is no soil or organism exists
pioneer species the first species to populate the area
secondary succession the series of changes that occur in an area where the ecosystem has been disturbed

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