(A) 20 to 35 billion cells
(B) 50 to 70 billion cells
(C) 10 to 20 billion cells
(D) 15 to 25 billion cells
(A) 20 to 35 billion cells
(B) 50 to 70 billion cells
(C) 10 to 20 billion cells
(D) 15 to 25 billion cells
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