Waves that do not need a medium to transfer energy are called A. Transverse Waves
B. Mechanical Waves
C. Electromagnetic Waves
D. Longitudinal Waves
(help for science Test)​

C. Electromagnetic waves

C electromagnetic waves

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.