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20 Cards in this Set

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Ecology
the scientific study of interactions among organisms and their environments.
Biosphere
the portion of Earth that supports life.
Abiotic Factors
The nonliving parts of an organisms' environment.
Biotic Factors
All the living organisms that inhabit an environment.
Population
A group of organisms that one species that interbreed and live in the same place at the same time.
Community
A collection of interacting populations.
Ecosystem
made up of interactions among the populations in a community and the commmunity's physical surroundings, or abiotic fators.
Habitat
The place where an organism lives throughout its life.
Niche
The role and posistion a species has in its environment.
Symbiosis
the realtionship which there is a close and permanent asssociation among organisms of different species.
Commensalism
A symbiotic realtionship in which one species benefits and another species is neither harmed nor benefited.
Mutualism
A symbiotic relaionship in which both species benefit.
Parasitism
A symbiotic realtionship in which one organism benefits at the expense of another.
Autotroph
Organisms that use energy stored in chemical compounds to manufacture their own nutrients.
Heterotroph
Organisms that cannot make their own food and must feed on other organisms.
Scavenger
Animals that feed on animals that have already died.
Decomposer
Organisms that break down and absorb nutrients from dead organisms.
Food Chain
A simple model that scientists use to show how matter and energy move through an ecosysytem.
Trophic Level
Organism in a food chain that represents a feeding step in the passage of energy and materials through an ecosystem.
Food Web
Model that expresses all the possible feeding relationships at each trophic level in a community.