Explain how a bathroom scale is like a biofeedback machine.

Ithink it is c ,i hope i you

The chemical reactions lab we did is typically called a "copper plating lab,  because the acid solution cleaned the pennies and made the copper look shinier;   the acid solution cleaned the paperclips and made them look like pennies;   &   the copper from the pennies was removed, and then added to the paperclips. 

Blue light reflected from the ball enters human eyes.