Because its air we cant see it thats why its clear because it would be scary if we were able to see air! :)
Answer:
-Facial grimacing or a frown.
-Writhing or constant shifting in bed.
-Moaning, groaning, or whimpering.
-Restlessness and agitation.
-Appearing uneasy and tense, perhaps drawing their legs up or kicking.
Explanation:
