Which one is not characteristic feature of subphylum vertebrata?

Options

A. Dorsal tubular nerve cord
B. Ventral muscular heart
C. Presence of notochord in the adult
D. Presence of kidneys

Answer

To determine which feature is not characteristic of the subphylum Vertebrata, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Phylum Chordata**:
- All members of the phylum Chordata possess a notochord at some stage of their life cycle. This is a flexible rod-like structure that provides support.

2. **Identify the Subphyla of Chordata**:
- Chordata is divided into three subphyla: Urochordata, Cephalochordata, and Vertebrata.
- Each subphylum has different characteristics regarding the presence and persistence of the notochord.

3. **Characteristics of Vertebrata**:
- In Vertebrata, the notochord is present during the embryonic stage but is replaced by the vertebral column (backbone) as the organism develops.
- Other key features of Vertebrata include:
- A vertebral column (backbone)
- A tubular nerve cord
- A muscular heart that is ventral (located on the front side)
- A pair of kidneys for excretion

4. **Identify the Incorrect Feature**:
- Since the notochord is only present in the embryonic stage and is replaced by the vertebral column in adults, the presence of a notochord in adults is not a characteristic feature of Vertebrata.

5. **Conclusion**:
- Therefore, the answer to the question "Which one is not a characteristic feature of subphylum Vertebrata?" is the presence of notochord in adults.

### Final Answer:
- The presence of notochord in adults.

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