Question

in the video loaded onto canvas about the experiment run by mark raser, what did he use to track the amount of contact that occurred among children in the classroom?
none of these answers are correct
a powder called glow germ
invisable ink
hidden cameras

Explanation:

Mark Raser used a powder called Glow Germ in his experiment to track the amount of contact among children in the classroom. Hidden cameras and invisible ink are not relevant to this specific experiment described.

Answer:

C. a powder called Glow Germ