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Ecosystems-Rankin
Vocab Terms
23
Science
9th Grade
10/08/2009

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Term
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Mutualism
Definition
A symbiotic relationship in which both species benefit
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Commensalism
Definition
A symbiotic relationship in which one species benefits and the other species is neither harmed nor benefited.
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Parasitism
Definition
A symbiotic relationship in which one organsim benefits at the expense of another, usually another species.
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Heterotroph
Definition
Organisms that cannot make thier own food and must feed on other organisms for energy and nutrients.
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Producer
Definition
An organism which produces its own food through photosynthesis
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Omnivore
Definition
An animal that feeds on both animal and vegetable substances
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Ecosystem
Definition
A community of plants, animals and microorganisms, along with their environment, that function together as a unit. An ecosystem can be as large as a rain forest or as small as a rotting log.
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10% Rule
Definition
10% of the energy available at one trophic level is transferred to the next trophic level.
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Autotroph
Definition
An organism that makes organic material from inorganic material; a primary producer; examples include plants, phytoplankton, and some bacteria
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Consumer
Definition
An organism that feeds on other living organisms, for example animals and parasitic plants would be considered consumers. In a food chain, herbivores that eat green plants are primary consumers and carnivores that eat herbivores are secondary consumers.
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Scavenger
Definition
An animal that eats dead remains and waste of other animals and plants.
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Ecological
Pyramid
Definition
A diagram that shows the relative amounts of energy or matter, or numbers of organisms within each trophic level in a food chain or food web
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Habitat
Definition
The location and environmental conditions in which a particular organism (plant, animal fungus or bacterium) normally lives.
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Predator
Definition
Any animal that lives by preying on other animals, where a hunting organism feeds on its prey.
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Herbivore
Definition
An organism that eats plants
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Decomposer
Definition
Organisms such as fungi and bacteria that feed on dead material causing the chemical breakdown of the material
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Food Chain
Definition
A transfer of food energy from plants to one or more animals; a series of plants and animals linked by their food relationships
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Niche
Definition
The role or functional position of a species within the community of an ecosystem.
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Prey
Definition
An animal that is eaten by other animals.
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Carnivore
Definition
Any organism that eats other consumers (sometimes referred to as "meat eaters")
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Trophic Level
Definition
The position that an organism occupies in a food chain -- what an organism eats, and what eats the organism.
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Food Web
Definition
A community of organisms where there are several interrelated food chains
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Symbiosis
Definition
Where organisms live together to their mutual benefit.
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