Answer: These are the "villi" ; which are "finger-like" projections that increase the surface area for absorption of nutrients.
Furthermore, there are "microvilli " attached to these "villi" , which further increase the surface area for better absorption of nutrients.
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C. Drilling a hole in the skull was involved in the practice of trepanation.
1.a 2.c 3.d. 4.b 5.e 6.g 7.f 8.h 9.j 10.i