Final answer:
The organization that describes an animal's body structure is cells, tissues, organs, organ systems.
Step-by-step explanation:
The kind of organization that describes an animal's body structure is cells, tissues, organs, organ systems.
In vertebrates, such as fish, amphibians, reptiles, birds, and mammals, the body is made up of cells, which form tissues, which then form organs, and finally, organs work together to form organ systems. Each level of organization has specific functions and contributes to the overall functioning of the body.