Which group of animals has a segmented spinal column together with a few primitive forms in which the backbone is represented by a notochord?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. Vertebrata.
- The Vertebrata group of animals is characterized by having a segmented spinal column or backbone, known as the vertebral column.
- In the Vertebrata subphylum, the backbone is composed of individual vertebrae that encase and protect the spinal cord.
- However, in some primitive forms of vertebrates, the notochord—a flexible, rod-like structure—serves as the primary support structure.