Determine the independent variable for the following experiment conducted:
a
bees were observed spending hours flying around the paper carriers when they wear
bright yellow "high visibility" vests, but do fly around when the paper carriers do not
wear bright vests.

Answer(a)   the matererials that are in contact, the two materials and the nature of their surfaces/// (b)/// the force pushing the two surfaces together, pushing the surfaces together causes the more of the asperities to come together and increases the surface area in contact with each other