The true statement is:
An ecosystem consists of living things that interact in the same environment.
This statement accurately defines what an ecosystem is, highlighting the interaction of living organisms (biotic factors) with their physical environment (abiotic factors).
The other statements contain inaccuracies:
- Biomes typically contain many ecosystems, but they don't inherently provide ecosystem services; those services arise from the functioning of ecosystems within biomes.
- An ecosystem is not classified by factors such as temperature and precipitation; rather, those factors are used to classify biomes.
- Some biomes, such as those that encompass microscopic life (like certain marine ecosystems), may indeed be small, but this statement is vague and less commonly accepted.