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Dr. Schweitzer found structures identical to modern red blood cells and blood vessels inside the bone. Which organ system do blood cells and blood vessels belong to? A. circulatory system B. nervous system
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Dr. Schweitzer found structures identical to modern red blood cells and blood vessels inside the bone. Which organ system do blood cells and blood vessels belong to? A. circulatory system B. nervous system C. respiratory system D. skeletal system ​

User Bellu
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Answer:

A. Circulatory system

Step-by-step explanation:

Circulatory system consist of heart,blood cells&blood vessels

User Pawel Szulc
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