E. What is one way that your body knows if it is upside-down or not?

You get some type of pressure that you start to feel in your muscles and joints from gravity and movement. How do they say it? Something called "seat-of-the-pants" (something like that). You get some type of pressure, and your body senses it, and it knows when you are upside-down or not, because if you're not, then you won't get any pressure in your muscle.

Hope this helped!

Have a day!

i'm assuming that the correct answer is indeed the first one/ "a"..

explanation: no but i do not usually comment