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5 votes
5 votes
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? Question 21 options: The cells form clumps.

The cells keep moving about.
The cells have different shapes.
The cells are very small in size.

User WeiHao
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1 Answer

19 votes
19 votes

The cells are very small in size.

That's what I would say.

User Evgeni Fotia
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