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Your skin and white blood cells fight infections together by:

A. white blood cells form a protective layer on your skin.

B. your skin funnels germs through your pores to your white blood cells, so they can destroy them.

C. your skin prevents most germs through your pores to your white blood cells, so they can destroy them.

D. when you get a cut, white blood cells rush to the site to form a clot over the cut.

Physical activity reduces the risk of osteoporosis by putting__________ under stress ______the destiny of the bones.

A. joints & decreases

B. bones & increases

C. ligaments & increases

D. bones & decreases