If astronauts spend long periods in zero gravity only if calcium is reabsorbed in their bodies, then astronauts on a Mars voyage will arrive with brittle bones. If astronauts attempt a voyage to Mars only if they spend long periods in zero gravity, then astronauts on a Mars voyage will arrive with brittle bones. Thus, astronauts on a Mars voyage will arrive with brittle bones.
(Z, C, B, V)
P.S: indirect proof(IP) cannot be used!
- suggest using Reductio ad absurdum and Conditional Proof if needed
Please fix the following input errors:
