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Blood is a connective tissue composed of red blood cells, white blood cells, and blood platelets. Why is it that we can see blood cells only with a microscope?

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vansoffvignesh
The answer is simple because its microscopic and can only be viewed under a microscope.  
kinyuy2000
Because Blood cells are like Microorganisms that can not be seen with the keen eye, it can only be seen with the help of a microscope.

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