Both humans and animals communicate a lot through their body postures. A cat,when angry,humps its back and its skin ruffles up so that it appears bigger and more dangerous.In this Humans frown when in doubt and smile when happy. We use the thumbs up or the thumbs down signs as common gestures of approval or disapproval by extending the thumb upward or downward. we also make use of a universal sign language; signs do not mean the same all over the world
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