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Population
All the individuals of a species that occupy a particular geographic area at a certain time
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Exponential Growth
Accelerating growth that produces a J shaped curve when the poulation is graphed against time.
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Limiting Factors
A factor that limits the growth, distribution, or amount of a population in an ecosystem e.g. The amount of water in the location
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Carrying Capacity
- The size of a population that can be supported indefinitely bu the available recources and services of an ecosystem

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Ecological Niche
The way in which an organism occupies a position in an ecosystem, including all the biotic and abiotic factors
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Predator
An organism that kills and consumes other organisms
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Prey
An organism that is eaten as food by a predator
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Mutualism
A symbiotic relationship between two species in which both species benefit from the relationship
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Parasite
An organism whose niche is dependent on a close association with a larger host organism
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Competition
When two or more organisms compete for the same resource in the same location at the same time
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Sustainable Use
Use that does not lead to long- term depletion of a resource or affect the diversity of the ecosystem from which the resource is obtained
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Doubling Time
The period of time that is required for a population to double in size
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Ecological Footprint
A measure of the impact of an individual or a population on the environment in trms of energy consumption, land use and waste production
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Unsustainable
A pattern of activity that leads to a decline in the function of an ecosystem
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Sustainability
Use of Earth's resources, including land and water, at levels that can continue forever
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Ecosystem Services
The benefits experienced by organisms, including humans, that are provided by sustainable ecosystems
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Desertification
The change of non-desert land into desert, which may result from climate change or from unsustainable farming or water use
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Ecotourism
A form of tourism that is sensitive to the health of an ecosystem and involves recreational activities provided by sustainable ecosystems
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