21 terms

Population and Communities ch 21.1/2

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organism
a living thing
habitat
the specific environment that provides the things an organism needs to live, grow, and reproduce
biotic factor
a living part of an organism's habitat
abiotic factor
a nonliving part of an organism's habitat
photosynthesis
the process in which some organisms use water along with sunlight and carbon dioxide to make their own food
species
a group of organisms that are physically similar and 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
ecosystem
the community of organisms that live in a particular area, along with their nonliving surroundings
ecology
the study of how organisms interact with 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
limiting factor
an environmental factor that prevents a population from increasing
carrying capacity
the largest population that an area can support
biodiversity
the number of different species in an area
element
any substance that cannot be broken down into simpler substances
compound
two or more elements that are chemically combined
mixture
two or more substances that are mixed together but not chemically combined
solution
a well-mixed mixture containing a solvent (large amount) and at least one solute (lesser amount) that has the same properties throughout