system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do cockroaches fall apart so quickly when they die?

I've noticed that whenever I find a dead cockroach it always has some of its legs lying nearby and when I pick it up to throw it away it's brittle and crumbly. I'd understand if it was behind some dresser that I hadn't cleaned in a year, but this one appeared overnight.
gpt
Well one possibility is that it's not a dead cockroach, it's a molt; the cockroach just shed its exoskeleton.

But also remember that bugs are kinda.... inside out compared to us.  We die, and maybe if we dry up our flesh wraps around our bones and might hold us together.  But their "bones" are on the outside, so as their meat decays the sections of their exoskeleton separate.