What is the chemical nature of biogas. Name an organism which is involved in biogas production?

Explanation

**Step-by-Step Solution:**

1. **Understanding Biogas:**
- Biogas is a type of renewable energy source that is produced through the anaerobic digestion of organic matter. This process occurs in the absence of oxygen.

2. **Chemical Composition of Biogas:**
- The primary component of biogas is methane (CH₄), which constitutes about 50-70% of its composition.
- Other components include carbon dioxide (CO₂), which makes up about 30-40%, along with trace amounts of nitrogen (N₂), hydrogen sulfide (H₂S), and nascent hydrogen.
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