Ecosystem Components
Elementary School
Definition
The living and non-living parts of an ecosystem that interact with one another. Living (biotic) parts include plants, animals, and microbes, while non-living (abiotic) parts include sunlight, water, soil, and temperature.
Worked examples
A pond ecosystem: biotic parts include fish, algae, bacteria, lily pads, and frogs; abiotic parts include water, sunlight, dissolved oxygen, and water temperature.
Both living organisms and non-living factors work together to form the complete ecosystem.
In a desert, cacti (biotic) depend on sand (abiotic), while temperature and rainfall (abiotic) determine which animals (biotic) can survive.
Abiotic components directly influence which biotic components can exist in the ecosystem.
Common mistakes
- Dead leaves and rotting logs are abiotic because they are not alive → Dead leaves and rotting logs are still biotic components Biotic means derived from living things, even if the organism is no longer alive.
- Air is a biotic component because animals breathe it → Air and gases like oxygen are abiotic components Air is non-living matter, even though living things depend on it.
- Only plants and animals count as biotic components → Biotic components include plants, animals, fungi, bacteria, and all microorganisms Microscopic organisms like bacteria are living parts of every ecosystem.
Where you'll use it next
You'll use ecosystem components when studying food webs, energy flow, and nutrient cycles in ecology, and later when analyzing how environmental changes affect entire ecosystems in environmental science.
See also
Reviewed by Pat Cheng, M.Ed. — StudyPug Curriculum Lead · Last updated June 6, 2026