system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why aren't there organisms that live on the sun, eat fire, and drink heat? In other words why does there need to be water for life?
gpt
The only life we know of occurs as chemical reactions - complex molecules interacting through electrical forces - in liquid water.  "Exotic" life that might function similarly but use different chemicals in something other than water (e.g., liquid methane on Titan) is a topic of speculation, but has never been detected.

The Sun is too hot for molecular bonds to exist, so there is no way for different nuclei to interact with each other except fusion in the core or keeping each other apart by mutual repulsion of protons.  At such temperatures, matter is ionized and electrons move freely.  

"Chemistry" in the normal sense does not exist in such an environment - there are simply atomic nuclei and subatomic particles.