The major cause of death in developing countries is infectious diseases, such as malaria. In developed countries the major causes are
a. infectious diseases, such as cholera.
b. non-infectious diseases, such as cancer.
c. injuries.
d. both a and c.
Answer: B
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Indicate whether this statement is true or false.
Which line, A, B, C, D, points to a cell that will participate in the secondary immune response?
1.A
2.B
3.C
4.D
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A. 1 B. 2 C. 3 D. 4