Is notochord is present in chondrichthyes?

Yes, the notochord is present in chondrichthyes, which include sharks, rays, and skates. In these cartilaginous fish, the notochord serves as a flexible rod that provides support during development and persists into adulthood, although it is often replaced by a more complex vertebral column in other vertebrates. The notochord is a key feature in the early development of all chordates, including chondrichthyes.