RBCs must be continually produced by the body because a. The iron within the RBC wears out

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RBCs must be continually produced by the body because 

a. The iron within the RBC wears out and must be replaced. 

b. RBCs cannot maintain themselves and wear out. 

c. RBCs are continuously entering and being lost from the GI tract. 

d. RBCs are processed into bile salts and must be replaced.

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