Give two peculiar characters of phylum platyhelminthes.

Explanation

### Step-by-Step Solution:

1. **Definition of Phylum Platyhelminthes**:
- Phylum Platyhelminthes is commonly known as the phylum of flatworms. This group includes various species that are characterized by their flat body shape.

2. **First Peculiar Character - Triploblastic Organization**:
- One peculiar characteristic of Platyhelminthes is that they are triploblastic. This means that their bodies are developed from three germ layers: ectoderm, mesoderm, and endoderm. The presence of the mesoderm is significant as it allows for the development of more complex structures.

...