PLEASE ANSWER
Which question would best identify a wave as being electromagnetic?

A. Does it travel through a vacuum?

B. Does it travel due to a disturbance?

C. Does it travel through matter?

Aresearcher finds that white bread contains more preservatives and has a higher moisture content than wheat bread. she designs a test to sermons whether the type of bread, white or wheat, affects the amount of mold growth. what must be done for the researcher to accurately measure the dependent variable?