The dura mater surrounding the brain consists of two layers. Give a functional reason for the fact that there are two layers instead of only one.
A. The two layers form a stronger blood-brain barrier.
B. Spaces between layers collect blood for return to the venous system.
C. Fluid between the layers reduces friction.
D. Arteries are sandwiched between the layers.
E. The spaces are where cerebrospinal fluid is reabsorbed.
Answer: B
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