How do mealworms breath?

There is no oxygen in space, the only foreign substance your likely to come across are gamma rays from the sun, or foreign planets. If in bare space, the side of your body pointing towards the sun...

o2 or oxygen

They breath in oxygen and breath out carbon dioxide, like a human through it's lungs

because when you breath out your mouth you've been eating stuffso it smells of what you have been eating. if you breath through your nose, it doesn't smell of anything.

Because your body needs oxygen and to get rid of carbon dioxide.