State the function of malpighian tubules.

Explanation

### Step-by-Step Solution:

1. **Identify the Organ**: The Malpighian tubules are excretory organs found in insects.

2. **Primary Function**: The main function of Malpighian tubules is to remove nitrogenous waste products from the insect's body. This is essential for maintaining the organism's internal environment and preventing toxicity from waste accumulation.

3. **Secondary Function**: In addition to waste removal, Malpighian tubules also reabsorb certain essential components. This means that while they excrete waste, they also recover valuable substances that the insect needs to conserve.

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