The closer the field lines are drawn together, the stronger the field being described.  Jimbo was playing with magnetic field lines by manipulating them. If he moves the field lines closer together, what happens to the strength of the field increases or decreases?
increases

Air pressure is less at higher elevations.  We don't need oxygen masks when we descend Everest because the air pressure is low or high?
high

Smoking reduces the amount of oxygen available for diffusion at the lungs, so less oxygen gets absorbed and blood is oxygenated to a lesser degree.  More oxygen absorption means more or less oxygen in the blood?
more