Name two special categories of microbas involved in production of biogas. Write composition of biogas.

Explanation

**Step-by-Step Solution:**

1. **Identify the Microbial Categories:**
- The two special categories of microbes involved in the production of biogas are:
- **Decomposer Microbes:** These microbes break down biomass (organic matter) in anaerobic conditions, leading to the production of simpler compounds.
- **Fermentative Microbes:** These microbes convert the simpler compounds (monomers) into organic acids during the fermentation process.

2. **Identify Methanogenic Bacteria:**
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