they'll prolly have to bring them with them and after that, it's a closed loop system with EVERYTHING recycled, everything... with minimum replenishment from earth of what finally breaks down is my guessthere are no nutrients in martian soil...you cannot grow produce in a soil which has no nutrients whatsoever.
they'll prolly have to bring them with them and after that, it's a closed loop system with EVERYTHING recycled, everything... with minimum replenishment from earth of what finally breaks down is my guess