What makes it hard for an astronaut to breathe in space ?

probably the fact that there's no oxygen to breathe in space :)

Explanation:

they need a oxegen tank cause you can’t breathe in space there’s no air cause there’s no trees so it’s like scuba diving you can’t breathe with out a oxygen supply and it might be uncomfor table and even few 30 mins you have to get a new oxygen tank (sorry if I’m wrong :clownface: )

human-caused climate hope this

i think the answer is b.