Max Bennett:

Humans may have also evolved a unique hardwired instinct to ask questions to inquire about the inner simulations of others. Even Kanzi and the other apes that acquired impressively sophisticated language abilities never asked even the simplest questions about others. They would request food and play but would not inquire about another’s inner mental world. Even before human children can construct grammatical sentences, they will ask others questions: “Want this?” “Hungry?” All languages use the same rising intonation when asking yes/no questions. When you hear someone speak in a language you do not understand, you can still identify when you are being asked a question. This instinct to understand how to designate a question may also be a key part of our language curriculum.