Why do plaque deposits make pumping blood more difficult?
A) The veins and arteries are less elastic.
B) The volume of the blood vessels decreases.
C) A higher pressure is required to force blood through the vessels.
D) all of the above
E) only A and B
Question 2
A minimum temperature exists (absolute zero). Why does no known maximum temperature exist?
A) Scientists have not yet determined what instruments might be able to measure the maximum temperature.
B) Scientists disagree on the pressure conditions with which to measure the maximum temperature.
C) Assuming no limit on the relative speed of atoms and molecules, it follows that there is no maximum temperature.
D) The maximum temperature is known to exist on the sun but we have not been able to measure it yet.