Option 1: Mineralized blood. This option suggests that the ancient mummies in Egypt have their arteries intact because their blood has been mineralized or turned into minerals. However, this is not the correct answer. Blood does not naturally mineralize over time, so it is unlikely to be the reason for the well-preserved arteries in the mummies.

Option 2: Fibroblasts fiber. Fibroblasts are cells in the body that produce fibers, such as collagen. This option suggests that the fibroblast fibers contribute to the preservation of the mummies` arteries. However, while fibroblasts play a role in maintaining tissue structure, they are not directly responsible for preserving arteries.

Option 3: Elastic fiber. This is the correct answer. Elastic fibers are a type of connective tissue that provides elasticity and resilience to blood vessels, including arteries. When the arteries are well-preserved, it means that the elastic fibers have remained intact over time, allowing the arterial walls to maintain their structure.

Option 4: Brown fat. Brown fat is a special type of fat that generates heat in the body. This option is unlikely to be the reason for the intact arteries in the mummies, as brown fat is not directly related to arterial preservation.

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