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Respiratory and Urinary › View

Alveoli increase the surface area in the lungs to allow…

A. More nutrients to be absorbed

B. You to breathe faster

C. You to breathe slower

D. More O2 and CO2 to exchange

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Immunity in Humans › View

What are antigens

A. proteins found on lymphocytes surface

B. foreign particles that enter the body

C. and subsequently stimulate the immune response.

D. microorganism that causes diseases.

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