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dem82 [27]
3 years ago
13

Which of the following is made of tissues and is part of an organ system? A. a heart B. a muscle cell C. a carbon atom D. a wate

r molecule
Biology
1 answer:
Zinaida [17]3 years ago
8 0

Answer:

heart

Explanation:

heart is an organ and part of the cardiovascular system

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