system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] If Venom and other symbiotes need hosts to survive, how did they live on their home planet?

Did they have different host species on their planet too? Or their planet has some kind of different atmosphere that makes them more solid?
gpt
They need hosts to survive in many environments. The symbiote homeworld Klyntar is not one of them, because Klyntar is most made of symbiotes. You would have to go miles deep to find actual dirt ground. They created the planet out of their biomass at the command of their god Knull, then reformed it from his throneworld into a prison for him. 

Though many symbiotes spend their entire lives never going to the homeworld, since it is controlled by one of the factions, which would wipe the mind of any symbiote of the expansionist faction.