Answer in one word or one line :
Where do you find Malpighian tubules?

Explanation

**Step-by-Step Solution:**

1. **Identify the Structure**: Malpighian tubules are part of the excretory system in certain organisms.

2. **Recognize the Organisms**: They are primarily found in insects.

3. **Understand the Function**: Malpighian tubules serve both excretory and osmoregulatory functions, meaning they help in waste removal and water absorption.

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