How Vertebrates differ from the other chordates in having the replaced in the adults by a?

Vertebrates differ from other chordates primarily in having a backbone or vertebral column, which replaces the notochord found in other chordates during their adult stage. This backbone provides structural support and protection for the spinal cord, allowing for greater mobility and complexity in body structure. Additionally, vertebrates typically possess a more developed nervous system and a distinct head with specialized sensory organs, setting them apart from their non-vertebrate chordate relatives.