Biosphere, organism, ecosystem, population Community, organism, ecosystem, biosphere Organism, population, community, ecosystem Population, ecosystem, community, biosphere
I gave my students this multiple choice question: Which list is correctly ordered from smallest to largest?

Only one answer is correct among these 4 choices:
- Biosphere, organism, ecosystem, population
- Community, organism, ecosystem, biosphere
- Organism, population, community, ecosystem
- Population, ecosystem, community, biosphere

Could you tell me which one is correct?

Organism, population, community, ecosystem