In vertebrates notochord becomes the following in adults

In vertebrates the notochord :-

Notochord is

Notochord is

Notochord is

Notochord is

In vertebrates, the notochord is modified into

In vertebrates, the notochord is modified into

In vertebrates, the notochord is modified into

In some chordates, the notochord is modified as the vertebral column. Such animals are called vertebrates. Which one of the following statements makes sense?

In some chrodates, the notochord is modified as the vertebral column. Such animals are called vertebrates which one of the following statements make sence.