I'm studying Bioscience externally with Charles Darwin University in Australia, and the textbook for this unit is "Essentials of Human Anatomy and Physiology" (Tenth Edition) by Elaine N. Marieb - Pearson Education Limited, 2014. In the textbook on p.35, Review Question 3 asks "Which is not essential to survival? (Water, Oxygen, Gravity, Atmospheric pressure, Nutrients)" Of course, the answer is supposed to be "gravity". For years, I've firmly believed (based on neglected theories of Einstein's, that I've built on) that gravity is as essential as any of the other items (without gravity, there would be no atoms and no water, oxygen, atmosphere etc.) My question is - If I'm asked this as a multiple choice in a test (meaning there'e no space for lengthy explanation), what should I do? Stick to the beliefs I've spent years developing, and get marked "wrong"? Or conform to tradition, answer "gravity" even though I don't want to, and get marked "right"?