What happens when :
Accidently, Planaria gets cut into many pieces ?

Explanation

### Step-by-Step Solution:

1. **Understanding Planaria**: Planaria are flatworms known for their remarkable ability to regenerate. They are often used in studies of regeneration due to their unique biological properties.

2. **Cutting Planaria**: When Planaria is accidentally cut into multiple pieces, each piece is still alive and contains the necessary cells for regeneration.

3. **Regeneration Process**: The process that occurs when Planaria is cut is called regeneration. This is a biological process where the organism can regrow lost or damaged parts.

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