In your opinion, why did humans develop visual forms of communication?

Answer the following question:

In your opinion, why did humans develop visual forms of communication?

Support your discussion with information/research from valid links. Make sure to give source web address with information.

Valid means:

No wikis

No Quora

No to About.com

No Study.com

Yes:

.edu sites

.org sites

Articles from magazines about visual communication (web address for article is acceptable)

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