system
Given the following post, respond as if you're commenting on Reddit:
human
[X-Men] How does Wolverine breath properly with a ribcage made of adamantium?
gpt
I assume that the adamantium injection process affected only bone tissue, so the cartilaginous tissue of the rib cage would remain unaffected and it would preserve its mobility.

Of course, adamantium is said to be heavier than bone tissue, so probably at first it was very difficult for Wolverine to breath. Probably over time his thoracic musculature grew in response to that extra effort, following what happened to the rest of the body.