Question

the human body is made up of different systems that work together to carry out the functions needed for life.
one of these necessary functions is breathing. the following systems help move air in and out of the body. apply what youve learned about the organization of the human body to order these systems from the simplest to the most complex.
simplest system
epithelial tissue, which protects the lungs from pollutants
epithelial cell, which helps form the lining of the lungs
lungs, which expand and contract to move air in and out
human, which is made up of multiple interacting organ systems
respiratory system, which brings oxygen into the bloodstream and removes carbon dioxide

Explanation:

The organization of the human body from simplest to most complex is cell, tissue, organ, organ system, and organism. An epithelial cell is a single cell (simplest). Epithelial tissue is made of many epithelial cells (next level). The lungs are an organ made of different tissues. The respiratory system is an organ system with the lungs as a major part. A human is an organism made of multiple organ systems (most complex).

Answer:

epithelial cell, which helps form the lining of the lungs; epithelial tissue, which protects the lungs from pollutants; lungs, which expand and contract to move air in and out; respiratory system, which brings oxygen into the bloodstream and removes carbon dioxide; human, which is made up of multiple interacting organ systems