Which of the labeled structures in the diagram is indicating a thick viscous fluid that prevents the lining of the digestive and respiratory tract from drying out?
A)D
B)E
C)F
D)G

Question

Which of the labeled structures in the diagram is indicating a thick viscous fluid that prevents the lining of the digestive and respiratory tract from drying out? 
A)D 
B)E 
C)F 
D)G

Quizplus · Accepted Answer

The Answer of Which of the labeled structures in the diagram is indicating a thick viscous fluid that prevents the lining of the digestive and respiratory tract from drying out? 
A)D 
B)E 
C)F 
D)G

Which of the Labeled Structures in the Diagram Is Indicating