The cycle in which nitrogen gas is changed into forms of nitrogen that plants can use
  • Food Chain
  • Nitrogen Cycle
  • Phosphorus Cycle
  • Carbon Cycle
The entire range of resource opportunities an organism is potentially able to occupy within an ecostystem
  • Fundamental Niche
  • Potential Niche
  • Carrying Capacity
  • Generation Time
Places where animals or plants naturally live and grow
  • Abiotic Factors
  • Communities
  • Habitats
  • Ecosystems
A stable, mature community that undergoes little or no change in species over time.
  • Climax Community
  • Ecological Succession
  • Pioneer Species
  • Primary Succession
Any living thing
  • Communities
  • Organisms
  • Ecosystems
  • Species
The relation between two different species of organisms that are interdependent
  • Mutualism
  • Parasitism
  • Symbiosis
  • Commensalism
Rate at which a specices can increase population
  • Reproductive Potential
  • Exponential Growth
  • Generation Time
  • Carrying Capacity
Living things in an ecosystem
  • Photosynthesis
  • Population
  • Biotic Factors
  • Ecosystems
Taxonomic group whose members can interbreed
  • Species
  • Population
  • Communities
  • Ecosystems
A close relationship; one species benefits, the other is harmed
  • Parasitism
  • Competition
  • Mutualism
  • Commensalism
Trees lose their leaves in fall and regrow in spring
  • Temperate Deciduous Forest
  • Tundra
  • Taiga
  • Desert
A group of organisms of the same species populating a given area
  • Population
  • Carrying Capacity
  • Food Web
  • Species
Niche where an organism is actually able to live
  • Carrying Capacity
  • Competition
  • Fundamental Niche
  • Commensalism
A short supply of resources restricting the growth of a population
  • Trophic Level
  • Commensalism
  • Mutualism
  • Limiting Resource
Groups of organisms at progressive levels
  • Climax community
  • Species
  • Levels of ecological organization
  • Population
The series of changes that occur in an area where no ecosystem previously existed
  • Primary Succession
  • Mutualism
  • Climax Community
  • Pioneer Species
Permanently frozen layer of soil under the surface
  • Desert
  • Permafrost
  • Tundra
  • Taiga
The process by which phosphorus is recycled in the ecosystem
  • Photosynthesis
  • Carbon Cycle
  • Nitrogen Cycle
  • Phosphorus Cycle
A series of steps in which organisms transfer energy by eating and being eaten User-
  • Population
  • Food Chain
  • Trophic Level
  • Food Web
A forested biome dominated by coniferous trees
  • Taiga
  • Tundra
  • Desert
  • Temperate Deciduous Forest
The organic circulation of carbon from the atmosphere into organisms and back again
  • Carbon Cycle
  • Food Web
  • Phosphorus Cycle
  • Nitrogen Cycle
Rate of increase or decrease of a population
  • Population
  • Generation Time
  • Carrying Capacity
  • Growth Rate
Cold and largely treeless across northern North America
  • Taiga
  • Tundra
  • Temperate Deciduous Forest
  • Desert
Different populations that live together in a defined area
  • Species
  • Ecosystems
  • Communities
  • Habitats
A close relationship; both species benefit
  • Competition
  • Mutualism
  • Commensalism
  • Parasitism
Distinct seasons and moderate climate
  • Temperate Forest
  • Tundra
  • Desert
  • Taiga
Interaction in which two or more species use the same limited resource
  • Parasitism
  • Commensalism
  • Mutualism
  • Competition
Shows how food chains are related within an ecosystem
  • Trophic Level
  • Population
  • Food Web
  • Food Chain
Rainfall less than 9.9 inches per year
  • Taiga
  • Desert
  • Tundra
  • Temperate Forest
A close relationship; one species benefits, the other doesn't benefit but isn't harmed
  • Mutualism
  • Commensalism
  • Competition
  • Parasitism
The first species to live in an area of primary succession
  • Climax Community
  • Primary Succession
  • Invasive Species
  • Pioneer Species
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