List two characters of Celphalochordata. Give one example.

Explanation

**Step-by-Step Solution:**

1. **Identify the Subphylum**: Cephalocordata is a subphylum under the phylum Chordata. This classification is important as it helps in understanding the evolutionary relationships among different organisms.

2. **Character 1 - Notochord**: One of the main characteristics of Cephalocordata is the presence of a notochord that extends from the head (cephalo) to the tail. Unlike other chordates where the notochord may be replaced by a vertebral column in adults, in Cephalocordata, the notochord persists throughout the life of the organism.

3. **Character 2 - Gill Slits**: Another significant characteristic is the presence of gill slits. These structures are crucial for respiration, allowing the organism to filter water and extract oxygen, which is essential for their survival.

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