50
12. One cubic millimetre of Sam's blood contains about 50,00,000 RBC. There are about 49,00,000 cubic millimetre of blood in her body. Then approximately how many red blood cells are there in his body?
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Step-by-step explanation:
How many red cells are there in one drop of blood?
A drop of blood the size of a pinhead contains approximately 5 million red blood cells (erythrocytes).
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