question: What anatomical feature is shared by all chordates?
distractor3: laxchord
distractor1: isochord
distractor2: botachord
correct_answer: notochord
support: Did you know that fish, amphibians, reptiles, birds, and mammals are all related? They are all chordates. Chordates are a group of animals that includes vertebrates, as well as several closely related invertebrates. Chordates (phylum Chordata ) are named after a feature they all share, a notochord. A notochord is a hollow nerve cord along the back.