system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 - where does skin in your body stop being skin? Is the roof of the mouth skin? The back of the throat? How does skin attach and transition to non-skin flesh?
gpt
humans, which are like the Eukaryotic single cell organisms from which we evolved, are just complex donuts. our entire digestive system is technically on the outside of our bodies, with skin and epithelial tissue forming a continuous donut meat sac.