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Chapter 1

Populations and Communities

organism a living thing
habitat an environment that provides the things an organism 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 which organisms use water along with sunlight and carbon dioxide to make their own food
species a grop of organisms that are physically similar and can mate with each other and produce offspring that can also mate and reproduce
population all members of one species in a particular area
community all the different populations that live together in an area
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 birth rate of a population is 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 enviromental factor that causes a population to decrease
carrying capacity the largest population that an area can support
natural selection a characteristic that makes an individual better suited to its environment may eventually become common in that species through a process called natural selection
adaptions the behaviors and physical characteristics that allow organisms to live to live successfully in their environments
niche the role of an organism in its habitat, on how it makes its living
competition the struggle between organisms to survive as they attempt to use the same limited resources
predation an interaction in which one organism kills another for food
predator the organism that does the killing
prey the organism that is killed
symbiosis symbiosis is a close relationship between two species that benefits at least one of the species
mutualism the relationship in which both species benefit
commensalism a relationship in which one species benefits and the other species is neither helped nor harmed
parasitism one organism living on or inside another organism and harming it
parasite the organism that benefits
host the organism it lives on or in
Created by: alayahc