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slavikrds [6]
2 years ago
15

Dr. Schweitzer found structures identical to modern red blood cells and blood vessels inside the bone. Which organ system do blo

od cells and blood vessels belong to? A. circulatory system B. nervous system C. respiratory system D. skeletal system ​
Biology
1 answer:
Marizza181 [45]2 years ago
4 0

Answer:

A. Circulatory system

Explanation:

Circulatory system consist of heart,blood cells&blood vessels

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