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B
Vertebral column
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C
Endostyle
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D
Myotome
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Solution
The correct option is A Chorda dorsalis The notochord is also known as chorda dorsalis. It is a rod-shaped cord of cells on the dorsal aspect of an embryo, defining the primitive axis of the body and serving as the center of development of the axial skeleton. It is the common factor of all chordates.