they wrote notes and they sent coins as pictures if the other person didn't know how to write or the person sending it would send the coin if they didn't know how to write.
They wrote to each other or spoke to each other mainly in latin or greek. In those days there were no computers or mobile phones.
Independent city-states formed in Greece
Insects communicate with each other by sensory.
I do not know how Jaguars communicate with each other. They might growl or purr.
They communicate with each other through Canalicili Extensions.
Because Greece had a lot of mountain ranges which prevented contact between city states.
Penguins communicate by touhing each other, or feeling each other
they hit each other
The reason why Greek City-States were set up like this was because of the mountains that surrounded each Greek City-State which made it difficult for the inhabitants of each City-State to communicate with other.
They communicate with each other by sharing their ideas and maybe talk about their experiments together or writing to each other
Salamanders communicate with each other by visual ways. They also secrete a chemical that other salamanders can smell as a way to communicate.
by talking to each other