Name the process by which a starfish develops its lost arm.

Explanation

**Step-by-Step Text Solution:**

1. **Understanding the Question**: The question asks for the name of the process by which a starfish can regrow a lost arm.

2. **Identifying the Organism**: The organism in question is a starfish, which is known for its ability to regenerate lost body parts.

3. **Defining the Process**: The process by which a starfish regrows its lost arm is known as "regeneration."

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