The answer is.d. stromatolites hope it help
Augustinian friar Gregor<span> Johann </span><span>Mendel.
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According to the question, the width of a pin is 0.001m and the width of a red blood cell is 6-8 μm.
Width of pin in μm = 1000μm.
So approximately 1000/8 red blood cells can fit which is equal to 125 RBCs.
Answer: 125 RBCs
