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Why are yaws contagious? And what causes yawns?
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Why are yaws contagious? And what causes yawns?

User Kitchenette
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Yawns are caused by lack of sleep and pple yawn bc of other people
User Ulf
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yawns can cause others to yawn. yawns are triggered by sleepiness or fatigue.

hope it helps!
User Iohans
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