★ Integumentary and Musculoskeletal Systems Quiz
What is the substance within the epidermis which shields us from the harmful ultraviolet (UV) rays?
A. melanocytes
B. keratin
C. melanin
D. sebum
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This group of bones consists of the upper and the lower limbs.
A. joints
B. axial skeleton
C. appendicular skeleton
D. cartilages
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