What do all animals share with phylum Chordata?

1. A notochord: a flexible, rod-like structure that runs along the back of the animal and provides support.

2. A dorsal nerve cord: a bundle of nerve fibers that runs along the back of the animal and serves as the main communication center.

3. Pharyngeal slits: openings in the pharynx (throat) that allow water to enter and exit the body. In some animals, these slits develop into gills, which are used for breathing.

4. A post-anal tail: a tail that extends beyond the anus. This tail is used for locomotion in some animals, such as fish.