Name the excretory organs of flatworms, annelids and insects.

Explanation

To answer the question regarding the excretory organs of flatworms, annelids, and insects, we can break down the information as follows:

### Step-by-Step Solution:

1. **Identify the Phylum of Flatworms**:
- Flatworms belong to the phylum **Platyhelminthes**.

2. **Excretory Organs in Flatworms**:
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