Vetrebrates have

Options

A. Dorsal tubular nerve cord
B. Ventrally situated heart
C. Body cavity with alimentary canal
D. All of the above

Answer

To answer the question "Vertebrates have," we need to analyze the options provided and determine which characteristics are true for vertebrates.

### Step-by-Step Solution:

1. **Identify the Characteristics of Vertebrates:**
- Vertebrates are defined by specific anatomical features. The key characteristics include:
- A dorsal tubular nerve cord.
- A ventrally situated heart.
- A body cavity with an elementary canal.

2. **Dorsal Tubular Nerve Cord:**
- Vertebrates possess a dorsal hollow nerve cord, which is a defining feature. This nerve cord develops into the central nervous system (CNS), which includes the brain and spinal cord.

3. **Ventrally Situated Heart:**
- Vertebrates have a heart that is located on the ventral side of their body. This heart can have different numbers of chambers, typically two, three, or four, depending on the type of vertebrate.

4. **Body Cavity with Elementary Canal:**
- All vertebrates have a body cavity that contains an elementary canal. This canal starts with the mouth and ends with the anus, allowing for the digestion and excretion of food.

5. **Conclusion:**
- Since all the mentioned characteristics are true for vertebrates, the correct answer to the question is "all of the above."

### Final Answer:
Vertebrates have a dorsal tubular nerve cord, a ventrally situated heart, and a body cavity with an elementary canal. Therefore, the correct answer is **all of the above**.

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