Which best describes the blood vessels?
A. They pump blood to the body.
B. They are the soldiers of the body.
C. They are body's transportation system.
D. They are the communication network of the body.
A. They pump blood to the body.
B. They are the soldiers of the body.
C. They are body's transportation system.
D. They are the communication network of the body.
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Answer:
D. They are the communication network of the body.