As an avarge kid there around 60,000 worth miles of vines. And as an adult it would go up to 100,000 miles worth of vines.
Answer:
Independent: electronics in room
Dependent: hours of sleep
Control: school nights, night routine, lighting of room, the time the person decides to go to bed
Confounding: the person(?? not entirely sure on this one)
Yes, a water droplet can be inhaled into the lungs.
