Choose your answer before opening the explanation. This is a learning exercise, not a competency assessment.
Phase I loses about 30 per cent of its weight because:
- Microbes burn carbon and release it as gas
- Water is squeezed out
- Gypsum dissolves
- Straw is removed
See the answer and why
Microbes burn carbon and release it as gas Carbon leaves as carbon dioxide, so nitrogen per cent rises.

