Origin of Language
Chimps have words for bananas and grapes.
Monkeys have words for hawk and cougar.
My cat has a word for 'I am cold, please let me under the covers'.
Words arise from necessity. Animals use a language which works in two parts, which I call Focal:Emotional Language. It's basically a universal language. An object has focus, a sound has an emotion. Emotions are extremely primitive, virtually all mammals are shown to have them, so it's a pretty reliable method of communication.
'Fire bad' would be the 'pain' grunt when looking at a fire.
'Honey is delicious' would be poking a bit of honey comb while saying “mmm!”
Simple language is easy.
As for humans, nobody knows. Odds are our earliest language existed long before anything resembling humanity existed.
-Robert Allen