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

Explanation:

This follows the hierarchical organization of the human body: cells (the simplest structural and functional units) form tissues, tissues form organs, organs form organ systems, and organ systems make up a complete multicellular organism (the most complex level).

Answer:

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