Question

what is the purpose of the respiratory system? it provides structure for the body and protects important organs. it provides energy for the body. it circulates oxygen to tissues in the body. it filters air and brings oxygen into the body.

Explanation:

The respiratory system's main function is to filter air, take in oxygen from the air and expel carbon - dioxide. It is not responsible for providing body structure, energy, or oxygen circulation (which is mainly the circulatory system's job).

Answer:

It filters air and brings oxygen into the body.