Answer:
All the features i. e. postanal tail, pharyngeal slits, notochord and dorsal hollow nerve cord are present in chordates.
Explanation:
Postanal tail is characteristics of chordates in which tail arises from the posterior part of animal which helps in the movement of organisms such as fishes. Pharyngeal slits is a part present next to mouth which removes the water that is enter through mouth. This character is present in the fish. Notochord is a flexible bone which gives support to the body of chordates. Dorsal hollow nerve cord is a hollow tube consist of brain and spinal cord which control all body functions.