Haemophilia is a group of rare conditions that affects the ability of the blood to clot. These conditions are caused by mutations in the genes coding for factors involved in the blood clotting process. Two types of haemophilia are haemophilia A and haemophilia B. In 2021, there were $$\(7.87 \times 10^{9}\)$$ people in the world. There were 185218 people with haemophilia A and 37998 people with haemophilia B. The number of people with haemophilia is only an estimate. Give one reason why this is only an estimate. (1) ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................

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