How did Venom survived?

Could you elaborate on the specifics of how Venom, the iconic anti-hero from Marvel Comics, managed to survive despite his seemingly fatal condition? Was it through his unique symbiotic relationship with the alien parasite that gave him his powers, or did he possess some other extraordinary ability that allowed him to overcome the odds and continue fighting against all adversities? I'm genuinely curious to understand the mechanisms behind his survival and how it fits into the larger narrative of his character development.