Final answer:
Humans belong to the category Chordata because they have a backbone and are placed in the class of mammals. Within the mammal class, humans are placed in the primate order.
Step-by-step explanation:
Humans belong to the category Chordata because they have a backbone. The characteristics of humans, such as being able to move on their own, having hair, and milk glands, place them in the class of mammals. Within the mammal class, humans are placed in the primate order.