system
Given the following post, respond as if you're commenting on Reddit:
human
How do axolotles breathe?

I know that the spikes on their face are like gills, but I was wondering more about how that works in comparison to a mammalian respiratory system?
gpt
The gills have tiny blood vessels and a high surface area that allow the blood to get really close to the water so that oxygen in the water can diffuse into the blood and carbon dioxide in the blood can diffuse into the water.