The correct answer is All of the above answers are correct.
Here's a brief explanation of each option:
- Heterotrophs: Organisms that cannot produce their own food and rely on consuming other organisms.
- Detritivores: Organisms that feed on detritus, which is decomposing organic matter.
- Mainly bacteria and fungi: These are indeed key players in the decomposition process, breaking down organic materials.
- Decomposers: Specifically refers to organisms (including bacteria and fungi) that decompose organic matter.
Since all the options correctly describe organisms that chemically break down and consume organic material, the most comprehensive answer is "All of the above answers are correct."