In a normal electrocardiogram, the
a. p wave results from repolarization of the atria.
b. qrs complex results from ventricular depolarization.
c. p wave occurs after the qrs complex but before the t wave.
d. t wave represents depolarization of the atria.
e. repolarization of the atria is clearly visible.

What do scientific models predict will happen to earth's temperature if current trends continue unmitigated? a. earth will heat and cool in a natural cycle b. earth will heat up and then return to an ice age c. earth will continue to warm at a rate of 0.25 c per decade d. earth will start to cool at a rate of 0.25 c per decade appex