How would an astronaut die if he/she removed the helmet on mars?

explanation:

because there is no oxygen and just a little of air in the mars. and the temperature, his face would be freeze in just a few moments and would definitely cause to fatal. there are also many others reason why you should never take of helmet on ! : )

hope this : 3

there is no oxygen in the matian air. she/he would suffocate in within 15 seconds in a matter of time. while in her/his body there would be bubbles of nitrogen forming inside which will lead her/his heart to stop functioning which will then cause her/him to die - r.i.p

i believe the answer would be b. hope it : )