Diseases can be caused by inherited disorders, exposure to toxic substances, organ malfunction, and certain personal behaviors. Which of the following are paired correctly?
A. inherited disorders – down syndrome
toxins – lung cancer
organ malfunction – diabetes
personal behaviors – scurvy
B. inherited disorders – diabetes
toxins – lead poisoning
organ malfunction – goiter
personal behaviors – lung cancer
C. inherited disorders – down syndrome
toxins – lead poisoning
organ malfunction – diabetes
personal behaviors – lung cancer
D. inherited disorders – cystic fibrosis
toxins – lead poisoning
organ malfunction – skin cancer
personal behaviors – scurvy
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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