It was found that the astronaut in a spaceship has no difficulty in swallowing food even if they are upside down explain why? can you swallow food when you are upside down on earth explain your answer?

What do all macromolecules have in common with each other? oa. they all are formed from the same elements.ob. they all have major roles in cell membranesoc. they all act as catalysts in the body.od. they all have peptide bonds between carbon atoms.