Answer:
D. The respiratory stystem
Explanation:
The respiratory system is the structure cited with the highest level of structural organization, because it is formed by many organs, many atoms, cells and molecules.
Various organs interact in the human body, performing a certain function in the body. This set of associated organs forms a system.
The respiratory system is the set of organs responsible for absorbing oxygen from the air by the body and eliminating carbon dioxide removed from cells. It is formed by the airways and the lungs. The organs that make up the airways are: nasal cavities, pharynx, larynx, trachea and bronchi.
