The heart is to the as the brain is to the .
A. respiratory system, excretory system
...
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
Answers: 2
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