a six month old infant has been brought to the emergency room because she has been suffering from a chronic cough. In addition, her parents report that sometimes she would "wheeze" a lot more than they thought was normal for a child with a cold. Ellie has not shown much weight gain since her previous appointment 2 months ago. Upon arriving at the emergency room, the attending pediatrician noted that salt crystals were present on Zoey's skin. Which organelle is not working properly?