What is a trait that is ancestral to all chordates? A. a jaw bone B. a notochord C. an amniotic egg D. a vertebral column

B. a notochord

Chordates are a phylum in the animal kingdom which have the following characteristics

Pharyngeal gill slit

dorsal nerve

notochord

post anal tail

These organisms possess these ancestral traits which have evolved to a more complex and sophisticated features that most animals have today.