Ecology
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Levels of Organization
Organism
Population
Community
Ecosystem
Cycles of Matter
Hydrologic Cycle
Carbon Cycle
Nitrogen Cycle
Nitrogen Fixation
Succession
Primary Succession
Secondary Succession
Pioneer Species
Natural Disturbance
Human Activities
Biotic Interactions
Competition
Predation
Symbiosis
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Mutualism
Commensalism
Parasitism
Limiting Factors
Food
Shelter
Water
Space
Disease
Predation/Parasitism
Nesting Sites
Weather
Energy Transfer
Food Chain
Food Web
Trophic Levels
Producer
Consumer
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Primary Consumer
Secondary Consumer
Tertiary Consumer
Decomposer
Bibliography
Reflections
Disease
The Fifth Limited Factor
Disease can cause a major drop in the population of a species. If there is a common disease in a species, it could cause the species to become extinct.
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