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Blood cells are( concave, compound, or, thread-like) in shape because they lack a nucleus.

User Bperreault
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2 Answers

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The answer to your question is concave. Remember that blood cells must also act as vessels to carry oxygen to the body.
Hope this helps!
User Dougvj
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concave is the correct answer. Blood cells are concave so they can squeeze through small spaces.
User Jarora
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