system
Given the following post, respond as if you're commenting on Reddit:
human
How did the tongue evolve?
gpt
Are you saying what is its evolutionary function (e.g., identifying nutritious foods from poisonous foods)?  Or are you arguing how a complex organ developed when its early purposes may have not been worthwhile?  Or do you just want like a history of earliest evolutionary ancestor species with proto-tongues?

(Standard disclaimer: Not an expert on biology; just trying to get clarification).