system
Given the following post, respond as if you're commenting on Reddit:
human
[Avatar] Why does everyone speak the same language? Even back in the days of Avatar Wan, every human shown had a common language. What event took place that prevented the fracturing of language seen in our own universe?
gpt
It's possible that the language is actually that of the Lion Turtles. Since humans spent countless years living in cities on the backs of these giant beings, and communicated with them, they either learned language from them or just started using it after a while.