1. Vertebral Cord: Chordates have a notochord in embryo or throughout life. In advanced animals the notochord is replaced by the spinal cord.
2. Brain: Chordates have nerve cords. The anterior end of the nerve cord forms the brain.
3. Symmetry: The posterior part of the nerve cord of Chordata animals forms the symphysis.
4. Pharyngeal gill slits: Chordates have pharyngeal gill slits at any stage of life or throughout life.
5. Heart: Cordata animals have a well-formed heart. The heart is always located at the apex of the intestine.
6. Endostyle: Chordata animals have endostyle. The endostyle later transforms into the thyroid gland.
7. Digestive system: Chordata have complete digestive system. It contains intracellular and extracellular digestive glands.
8. Tail: Cordatas have a post-anal segment elastic tail. Sometimes the tail can get lost during the transition.
9. Circulatory system: Chordates have a closed circulatory system. It is made up of blood, blood vessels and blood vessels. It has hepatic portal system.
10. Excretory system: The main excretory system of chordates consists of a pair of kidneys. Through this, nitrogenous wastes are removed from the body.
11. Body skin: The body skin of chordata animals consists of epidermis (derived from ectoderm) and dermis (derived from mesoderm).
12. Endoskeleton: The endoskeleton of chordates is made up of bone or cartilage.
13. Eyes: Cordatas eyes are simple in nature. It originates from the brain.
14. Genus: Chordata are unisexual. They have sex. Asexual reproduction is absent.
15. Osmoregulation: Osmoregulation of chordates occurs through the kidneys.
16. Silome: True silome is present in the body of chordates. Surrounding the heart is the pericardial cavity.
From the above discussion, it can be understood that the animals of this phase are at the highest level of the biosphere through evolution. As their brains are developed, they are establishing dominance everywhere. As the age of the earth increases, their structural characteristics will develop. As a result, they can control the world with their hands.