Which numbered feature in this figure is the youngest? 
Definitions:
Expiratory Reserve Volume
The additional amount of air that can be forcibly exhaled after the completion of a normal, controlled exhalation.
Anatomic Dead Space
The portion of the respiratory system that conducts air but does not participate in gas exchange, including the nose, trachea, and bronchi.
Anatomic Dead Space
The portion of the respiratory system where gas exchange does not occur, including the trachea and bronchi.
Alveolar Dead Space
is the portion of the respiratory system where alveoli are ventilated but not perfused with blood, thus not participating in gas exchange.
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