Besides many other factors, the nation's health system requires a continual supply of new blood from donors to replenish its stockpiles. Storing blood for long-term use is a delicate, expensive, and time-consuming process; moreover, many doctors believe that the stored blood is unreliable. When stored in a solution of plasma and nutritive dextrose (a sugar), fresh red blood cells can survive and remain viable for transfusion for only six weeks, therefore it cannot be used for long period.
Q:According to passage, which of the following can be the closest to the author appeal?
