What body system helps convert food into energy and nutrients that the body can use? A. nervous system B. urinary system C. respiratory system D. digestive system
D. digestive system
What body system uses the spinal cord and nerves to communicate with the brain? A. digestive system B. nervous system C. respiratory system D. urinary system
B. nervous system
What body parts act like doors that control blood flow in the heart? A. atria B. chambers C. valves D. ventricles
C. valves
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