According to the graph, what were the results of the vaccination between 1954 and 1960? A. The rate of polio remained the same.
B. The rate of polio decreased
C. The rate of polio decreased, then increased.
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D. The rate of polio increased

Cancer cells spread to other parts of the body by entering the bloodstream. which of the following organs could prevent a cancer cell in the bloodstream from spreading, and why? a. the spleen, because it releases lymphocytes into the blood b. the peyer's patches, because they release lymphocytes into the blood c. the lymph nodes, because they release lymph into the blood d. the thymus, because it releases lymph into the blood