Protochordates can be called invertebrate chordates. Why?

Moderate

A

They have a notochord like chordates and a ventral solid nerve cord like invertebrates.
B

They have a skull but not a vertebral column.
C

They have a notochord at least at some stage of their development which is not replaced by a vertebral column.
D

They have a closed circulatory system like chordates but a ventral heart like invertebrates.

Solution

Protochordates can be called invertebrate chordates because they have a notochord at least at some stage of their development which is not replaced by a vertebral column.
In urochordates, notochord is present in the larval tail.
In cephalochordates, notochord is present from head to tail and is persistent throughout the life.

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