1) Writing a letter and a pigeon taking it away to the person it has to go to.
2) Used to set up fire and from the fire, the smoke go's up in the sky and they the people
see it then they know that someone is trying to communicate with them.
3) Grunting and arm waving.
4) Drawing on walls .
5) Letters.
6) The drums.
7) Signaling lamp.
8) Barter system.
References:
- http://www.blurtit.com/q4131246.html
- http://www.blurtit.com/q2312929.html
- http://wiki.answers.com
- http://www.blurtit.com/q2312929.html
DONE BY: ISHVERJIT SINGH
No comments:
Post a Comment