paulettepb123 paulettepb123

05-12-2017
Physics

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Why are yaws contagious? And what causes yawns?

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Аноним Аноним

05-12-2017

yawns can cause others to yawn. yawns are triggered by sleepiness or fatigue.

hope it helps!

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lolzmonster lolzmonster

05-12-2017

Yawns are caused by lack of sleep and pple yawn bc of other people

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