Question

Which statement is true for cephalochordates? Notochord is present only in the larval stage; it is absent in adults. Notochord is present in the larval stage; it transforms to vertebrae in adults. Notochord is present throughout their lives.

Answer 1

Notochord is present throughout their lives.

Step-by-step explanation:

Within the phylum of the chordates there are three subphylum. Cephalochordates, Urocordated and Vertebrates. Unlike the others, in the cephalochordates the notochord is present throughout its life, this extends dorsally from the tail to the head. The cephalochordates are considered primitive animals, live in marine waters and they feed by filtering.

Answer 2

Notochord is present in the larval stage; it transforms to vertebrae in adults