Stu/pid question -_- am i still pan if i only have attractions to females nonbinary and like trans men

Astructural difference between the trachea and esophagus that prevents the trachea from collapsing is the presence of: a) smooth muscle b) skeletal muscle c) respiratory cilia d) rings of cartilage

Which of the following is the definition of ventilation as it relates to the respiratory system?

The heart and lung are located in which cavity ? thoracic