2.1.1—Biosphere composition
- Syllabus
- First assessment 2026
- Objective
- 2.1.1
- Level
- HL
Place the Entity on the Ecological Ladder
Organism → population → community → ecosystem → biosphere: each level adds relationships or physical context.
Use the smallest level that fits the question. A community contains interacting populations; an ecosystem adds abiotic environment; the biosphere contains all ecosystems.
One wolf is an organism; wolves of one species in one area are a population; wolves plus prey and soil form part of an ecosystem.
No. It is the total ecological system of life interacting with physical environments.
A biosphere is not just a list of organisms; it includes ecosystems and their physical interactions.