Mark the correct statement about vertebrates.

Moderate

A

The notochord is replaced by a bony vertebral column in all vertebrates.
B

The notochord is replaced by a cartilaginous vertebral column in all vertebrates.
C

The notochord is totally replaced by a bony or cartilaginous vertebral column in all vertebrates.
D

The notochord is replaced by a bony or cartilaginous vertebral column in most vertebrates.

Solution

The members of subphylum Vertebrata possess notochord during the embryonic period. The notochord is replaced by a cartilaginous or bony vertebral column in the adult. The notochord is persistent in some vertebrates like cyclostomes and cartilaginous fishes. Remnants of notochord called nuclei pulposi occur in the vertebral column of adult mammals.

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