Answer:
A. Circulatory System
Explanation:
The heart is the key organ in the Circulatory system. As a hollow, muscular pump, its main function is to propel blood throughout the body.
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Answer:
A. Circulatory System
Explanation:
The heart is the key organ in the Circulatory system. As a hollow, muscular pump, its main function is to propel blood throughout the body.