Oh yeah.
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Oh yeah. They've got tons of weird organs thanks to the Emperor's engineering. Most of them are normal super soldier stuff, improved blood clotting, that sort of thing. But they can also produce extremely acidic spit, which helps them break down materials for food in a pinch, or to be used as a weapon. They can also gain your knowledge by eating you. Genetic memory is a thing in 40k and Space Marines aren't the only ones capable of getting at it - see: Kroot.
They can also survive space longer than humans, as one might expect from space-faring super soldiers. Uhhh, what else....
You should probably just read this https://wh40k.lexicanum.com/wiki/Creation_of_a_Space_Marine