Answer:respiratory system
Explanation:The primary function of the respiratory system is to deliver oxygen to the cells of the body's tissues and remove carbon dioxide, a cell waste product. The main structures of the human respiratory system are the nasal cavity, the trachea, and lungs
Probably it would be like a room since the door would be the cell membrane and the nucleus would be your bed not 100% sure tho
The more advance the community the more complex the speciess
