Question

This question is abt yawning

Answer 1

c) I think the common belief is when someone feels sleepy, he/she yawns.

Answer 2

C. The common belief about yawning is that when we yawn people think that we're sleepy

E. We should cover our mouth while yawning as it is a sign of good habits
Our body makes us yawn what there is deficiency of oxygen or when we need more oxygen