When microscope slides are stained to show blood cells, the small red blood cells that appear on the slides are much more numerous than the large white blood cells. This supports the concept that
A. the body’s need for white blood cells is less than its need for red blood cells
B. red cells are more numerous because they are smaller than white blood cells
C. the nuclei of the white blood cells help them work more efficiently than the red blood cells, which lack nuclei
D. each kind of cell is present in the numbers best suited to meet the needs of the body
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Describe how a vaccine protects the body from disease.
A. weakened or dead pathogen is identified by the immune system causing the production of antigens
B. weakened or dead pathogen is identified by the immune system causing the production of antibiotics
C. weakened or dead pathogen is identified by the immune system causing the production of antibodies
D. a live pathogen is identified by the immune system causing the production of antigens
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