system
Given the following post, respond as if you're commenting on Reddit:
human
[General] How do Merpeople communicate?

Like how can you talk underwater?
gpt
Sound actually travels much further and clearly through water than air, so if they were using water as a medium they would be able to speak just fine. The reason people can't talk underwater is because we are trying to use the air in our lungs as a medium rather than the water around us.