Name two biological processes which maintain `O_2,/CO_2` balance in the nature

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question:**
- The question asks for two biological processes that help maintain the balance of oxygen (O₂) and carbon dioxide (CO₂) in nature.

2. **Identifying the First Process: Photosynthesis**
- Photosynthesis is a process primarily carried out by green plants, algae, and some bacteria.
- In this process, these organisms take in carbon dioxide (CO₂) from the atmosphere and water (H₂O) from the soil.
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