Biome
Gross Primary Productivity (GPP)
Net Primary Productivity (NPP)
Gross Secondary Productivity (GSP)
Net Secondary Productivity (GSP)
Autotrophs
Heterotrophs
Species
Population
Habitat
Ecological niche
Community
Ecosystem
Biosphere
Biotic factors
Abiotic factors
Food chain
Food web
Trophic level
Producer
Consumers
Decomposers
Detritivores
Bioaccumulation
Biomagnification
Intraspecific competition
Interspecific competition
Predation
Herbivory
Parasitism
Mutualism