A) cranium
B) vertebral column
C) pharyngeal slits
D) Both (a) and (b)
Correct Answer: D
Solution :
In adult vertebrates notochord is replaced by cranium and vertebral column and gives viability of movement. In mammals the notochord is represented as vestigial swellings called nuclei pulposi in vertebral column. The phylum- Chorda Tawas created by Balfour in 1880.
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