Scientists measured the concentration of anti-AQP4 antibody in the blood of people with NMO.The spinal cord is surrounded by small bones called vertebrae. For each person, the scientists also determined the number of vertebrae surrounding damaged nerve cells.Their results are shown in Figure 7.A scientist suggested that the concentration of anti-AQP4 antibody in a person's blood could be used to predict the number of vertebrae surrounding damaged nerve cells they are likely to have.Use Figure 7 to suggest reasons why this suggestion might not be valid (3)

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