First, because you need to be careful of what you are eating and should not eat.
Second, if you don't care about what you eating it could be really dangerous.
Because its air we cant see it thats why its clear because it would be scary if we were able to see air! :)
Answer:
same its prbly bc u dont sit up straight tho
i hope u feel better!! :)
I think the answer is b
I hope this helps :)
