Interactions of Living Things Vocabulary

The study of how living things interact with each other and their environment
abiotic factor
a nonliving part of an ecosystem
biotic factor
all the living things in an ecosystem
a group of organisms of the same species populating a given area
(ecology) a group of interdependent organisms inhabiting the same region and interacting with each other
All the organisms in a given area as well as the abiotic factors with which they interact; a community and its physical environment.
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part of Earth in which life exists including land, water, and air or atmosphere.
population density
number of individuals per unit of area
limiting factor
anything that restricts the number of individuals in a population
any close relationship between species, including mutualism, commensalism, and parasitism.
organism’s role, or job, in its habitat
the type of environment in which an organism or group normally lives or occurs
food chain
(ecology) a community of organisms where each member is eaten in turn by another member
food web
(ecology) a community of organisms where there are several interrelated food chains
water cycle
the continuous movement of water between Earth’s surface and the air, changing from liquid to gas to liquid