If in 1500 you dropped some European settlers in the Americas, there a high chance they'll survive. If in 2014 you drop some settlers in Mars, they would surely

If in 1500 you dropped some European settlers in the Americas, there a high chance they'll survive. If in 2014 you drop some settlers in Mars, they would surely die. Plenty of robots must be sent beforehand to build greenhouses, setup solar panel arrays, dig deep tunnels to provide shielding against cosmic radiation, etc.