Do not solely rely on the side view mirrors to give you the complete picture of the road, since all cars have blind spots. the driver should look over their shoulder before starting the maneuver.

True

Explanation:

When driving, it is important to always remember that car have blindspot; a spot that if an oncoming car occupies when in motion, the driver cannot see that car. Thus before starting a maneuver, look at your side view mirror, turn your head behind to look above your shoulder for 2 seconds to check your blindspot, before making a maneuver.  

they protect against unsafe foods and medicines being sold

explanation:

answer; archaeologists;