Basically yes.
yes,then everyone could understand each other
it helps them because when they make a mistake they get to understand each other and they say were they went wrong so everyone is happy. (everyone makes mistakes)
How did cavemen understand each other
Same as any language, allow an in-group to understand each other, and to exclude everyone else.
The possibility of nuclear war between America and Russia or China is very low because they understand the consequences of fighting each other.
they understand eachother by combining where they come from with each other.
No, but many understand each others alarm calls.
Understand each other
yes be cuz they can
Because birds understand each other better because they are the same species. It's a bit like cats and dogs. They don't understand each other but cats do understand other cats.
i have no friend
they helped each other