Select your answer:
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Polio › ViewA vaccine works by __________________________.
A. exposing your body to some form of a virus so that it learns how to fight the virus off
B. pumping your lungs with oxygen to help you breath more easily
C. boosting your immune system with vitamins
D. making the symptoms of a disease less painful
Integumentary and Musculoskeletal Systems › View
This group of bones consists of the upper and the lower limbs.
A. joints
B. axial skeleton
C. appendicular skeleton
D. cartilages