Which one is the oldest and most commonly used communication medium?
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The oldest known symbols created for the purpose of communication were cave paintings, a form of rock art, dating to the Upper Paleolithic age. The oldest known cave painting is located within Chauvet Cave, dated to around 30,000 BC.
Explanation:
The Postal Department was started in 1854. Railway Mail Service (RMS) was launched in 1907 and Air Mail Service (AMS) was introduced in 1911. The Postal Services are the oldest, cheapest and very popular means of communication. The postal network has been increasing since 1951.
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