- Pelagic zone
- Neritic zone
- Intertidal zone
- Oceanic zone
- Benthic zone
- Euphotic zone
- Disphotic zone
- Aphotic zone
- Plankton
- Nekton
- Benthos
- Producers
- Consumers
- Herbivores
- Omnivores
- Carnivores
- Scavengers
- Zooplankton
- Phytoplankton
- Decomposers
- Biotic
- Abiotic
- Limiting factors
- Biodiversity
- Competition
- Predation
- Herbivory
- Habitat
- Niche
- Mutualism
- Commensalism
- Parasitism
- Ozone layer
(source)