How do storage grain losses occur?

Explanation

### Step-by-Step Solution:

1. **Understanding Storage Grain Losses**: Storage grain losses refer to the reduction in the quantity and quality of grains stored for future use. These losses can occur due to various factors.

2. **Identifying the Types of Stress**: There are two main types of stress that contribute to storage grain losses:
- **Biotic Stress**: This includes living organisms that affect stored grains.
- **Abiotic Stress**: This includes non-living factors that can impact the grains.

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