system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How in the F do jellyfish register things like colors with no brains to process things like colors?

This may be a suuuuper high guy question... but I’ve seen specials about jellyfish and apparently they’ll gravitate towards reds or certain visuals. Since they have no brain or eyes for that matter, how in the F is that possible? How do they even function AT ALL with no brain? Nothing about it makes sense. Help me.
gpt
Instead of a single, centralized brain, jellyfish possess a net of nerves. This “ring” nervous system is where their neurons are concentrated—a processing station for sensory and motor activity.

These neurons send chemical signals to their muscles to contract, allowing them to swim, and do other stuff.

But they just don’t just swim aimlessly—some jellyfish can actually navigate.