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Biology, 10.11.2020 19:40 hannahponder

The heart is to the as the brain is to the . A. respiratory system, excretory system

B. muscular system, circulatory system

C. respiratory system, muscular system

D. circulatory system, respiratory system

E. circulatory system, nervous system

F. muscular system, nervous system

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The heart is to the as the brain is to the . A. respiratory system, excretory system

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