The immune system fights diseases. The circulatory system pairs with the immune system because ___.
A. blood is made in the bones.
B. plasma carries nutrients.
C. red blood cells carry oxygen.
D. white blood cells fight infection.
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Give one adaptation of alveoli for efficient gas exchange.
A. Alveoli have a one cell thick lining for a short diffusion pathway.
B. Alveoli have a small surface area for fast diffusion of oxygen.
C. Alveoli have many a thick lining for a long diffusion pathway.
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