abdullahy2009 abdullahy2009

21-10-2021
Biology

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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

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amerafelgeleta amerafelgeleta

21-10-2021

Answer:

A. Circulatory system

Explanation:

Circulatory system consist of heart,blood cells&blood vessels

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