Why do elbows face dorsally while knees face ventrally?
A. Both limb buds flatten and turn at about day 38.
B. The upper limbs rotate laterally about 180 degrees, and the lower limbs rotate medially about 180 degrees.
C. During development, the upper limbs rotate laterally about 90 degrees, while the lower limbs rotate medially about 90 degrees.
D. During development, the upper limbs rotate medially about 90 degrees, and the lower limbs rotate laterally about 90 degrees.
E. The upper limbs rotate medially about 180 degrees, and the lower limbs rotate laterally about 180 degrees.
Answer: C
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