1. If the diameter of a red blood cell is 6 times 10^-6m how many red blood cells will you need to make up an inch of a line? 

Iron is biologically important in the transport of oxygen by red blood cells from the lungs to the various organs of the body. In the blood of an adult human, there are approximately red blood cells with a total of of iron. On average, how many iron atoms are present in each red blood cell?  

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Iron is biologically important in the transport of oxygen by red blood cells from the lungs to the various organs of the body. In the blood of an adult human, there are approcimately 2.60x10¹³ red blood cells with a total of 2.90 g of iron. On the average, how many iron atoms are present in each red blood cell? (Molar Mass Fe= 55.85 g)