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Ecology Unit

organism a living thing
habitat a place where an organism lives that provides the things it needs to live grow and reproduce
biotic factor the living parts of an ecosystem
abiotic factor the non living parts of an ecosystem
photosynthesis the process used by plants and algae to make their own food
species a group of organisms that are physically similar that can mate with each other and produce offspring that can also mate and reproduce
population all the members of one species in a particular area
community all the different populations that live together in an area
ecosystem all the living and non living things that interact in an area
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 (joining) a population
emigration moving out of (leaving) a population
population density the number of individuals in a certain area (describes how crowded an area is)
limiting factor an environmental factor that prevents a population from increasing
carrying capacity the largest population that an environment can support
natural selection The series of changes in a population that make organisms better suited to their environment which increases their chances for survival
adaptations behaviors and physical characteristics of a species that allow them to live successfully in their environment (a result of natural selection)
niche an organism's particular role i its habitat
competition the struggle between organisms to survive as they attempt to use the same limited resources
predation an interaction in which one organism kills and eats another organism
predator in predation, the organism that does the killing
prey in predation, the organism that is killed and eaten
symbiosis a close relationship between two species that benefits at least one of the species
mutualism a relationship in which both species benefit
commensalism a relationship in which one species benefits, but the other species is neither helped nor harmed
parasitism a relationship in which one species lives on or in another and harm it
parasite in parasitism, the organism that benefits from the interaction
host in parasitism, the organism the parasite lives on or in (the organism that is harmed in the interaction)
Created by: sdix