Since there is no evidence whatsoever of aliens at this point, it follows logically that there is no evidence of alien respiratory systems.
The respiratory system is the system that handles breathing.
The Respiratory System
An alien species may have A different respiratory system than humans so it is completely possible that they may survive outside of our ideal conditions
The trachea is the airway in the respiratory system.
no, they do not have a respiratory system
The respiratory system.
Respiratory system
how does the respiratory system work
1. Respiratory system 2. Cardiovascular system
The lungs are part of the respiratory system! they help the circulatory by giving oxygen, but they are just respiratory.
cycling it is good for the respiratory system cycling it is good for the respiratory system
The respiratory system.