Because when you get sleepy your body goes into a sleep mode and takes in less air but since your awake and need more air you yawn to get 'emergency' air. Hope that helped
No, dogs do yawn too. I hope some other animals also yawn.
yes yes. Dogs yawn when there brain slows because of lack of oxygen, so it should be the same for humans That is true and YES it means you are *TIRED*
No. They yawn for the same reasons we do.
they yawn because when you yawn it passes on to other people . so you yawn then someone's right next to you then i think they inhale then they start to yawn ?
yes they yawn quietly
No, dogs do yawn too. I hope some other animals also yawn.
Same as humans because there tired
They don't. Ants have a completely different respiratory system to humans.
yes yes. Dogs yawn when there brain slows because of lack of oxygen, so it should be the same for humans That is true and YES it means you are *TIRED*
No. They yawn for the same reasons we do.
they yawn because when you yawn it passes on to other people . so you yawn then someone's right next to you then i think they inhale then they start to yawn ?
yes they yawn quietly
how do you know you yawn if you are sleeping?
No whales do not yawn.
Yes, yawn is an onomatopoeia.
Insects do not yawn. People necessarily do not yawn only when they are tired. Most people, after reading this, will yawn.
A yawn is normally a response to a change in activity, although if you did not get enough sleep, you could become tired and yawn.