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Digestive, Respiratory, Circulatory, and Excretory Your body requires constant oxygen and nutrients, But it must get rid o...
Bronchial tubes branch into alveoli, Which put oxygen in your in your bloodstream so you can stay alive, This process is d...
This gives the kidneys what they need In return, the excretory system Helps the circulatory system by Getting rid of carbo...
Your nervous system sends alerts, When your bones are hurt, When your bones break don   t be in fear, Your nervous system ...