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CaHeK987 [17]
3 years ago
8

Identify which of the following is the most complex and explain your answer choice:

Biology
1 answer:
spayn [35]3 years ago
5 0
The heart because the organ system function the human body
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Answer;

A. Blood

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Blood is the main connective tissue in the circulatory system, but it's a liquid connective tissue. Blood tissue is in the same family as bone and cartilage, but instead it has a liquid medium that holds it together.

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