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Hello!
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❖ The correct answer choice is B) is multicellular. When something is multicellular, it consists of two or more cells. When something is unicellular, it consists of only one cell and in this case we have 5 million red blood cells so that wouldn't make sense.
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~ ᴄʟᴏᴜᴛᴀɴꜱᴡᴇʀꜱ