she would have to stay there for every food she ate
Nothing
They would float on the surface of the Mercury but they wouldn't react with the Mercury.
You die.
YOu die
Nothing good!
steel will float in mercury
you would eat fish
it would survive
Thermometers would be useless.
YOu would die..
If you ate human poo, (which you shouldn't) you would most likely get very sick.