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Which of the following structure is present in all chordates?
Option: 1
Cranium
Option: 2
Notochord
Option: 3
Spinal cord
Option: 4
Vertebral column
Answers (1)
Notochord:
- The name ‘Chordata’ is based on the presence of notochord at some stage or throughout the life cycle.
- It is a rod-like structure placed dorsally between the alimentary canal and nerve cord.
- It is derived from the mesoderm.
- In the vertebrates, it is present during the embryonic development.
- It is then replaced by the vertebral column (spine) in the postnatal stage.
-
Presence of notochord during or at some stage of life cycle is an essential feature of all
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