Assertion: yawning | /r/HasProperty | triggered by fatigue
Facets:
value: most often
type: DEGREE
Source sentences:
text: Most scientists believe that yawning is triggered by fatigue or boredom, because during these times breathing may be more shallow than normal, transporting a smaller amount of oxygen to the lungs through the cardiovascular system.
text: Most often, yawns are triggered by fatigue or boredom.
text: Most scientists believe that yawning is triggered by fatigue or boredom, because during these times breathing may be more shallow than normal, transporting a smaller amount of oxygen to the lungs through the cardiovascular system.