List three peculiar characters of phylum Arthopoda.

Explanation

### Step-by-Step Solution:

1. **Jointed Appendages**: One of the most distinctive features of phylum Arthropoda is that they possess jointed legs or appendages. This characteristic allows for greater flexibility and mobility, which is essential for their survival and adaptation in various environments.

2. **Chitinous Exoskeleton**: Arthropods have an exoskeleton made of chitin. This tough, protective outer layer provides structural support and protection against physical damage and dehydration. The presence of chitin is a significant factor in the success and diversity of arthropods.

3. **Open Circulatory System**: Arthropods exhibit an open circulatory system, where the blood (or hemolymph) is not confined to blood vessels. Instead, it bathes the organs directly in a cavity called the hemocoel. This system allows for efficient nutrient and waste transport throughout their body.