The digestive system&#146;s primary function has to do with processing food, the circulatory system moves the blood, and the respiratory system handles air exchange.
(The digestive system&#146; to do; with processing food) (the circulatory system; moves; the blood) (the respiratory system; handles; air exchange)
The digestive system&#146 the circulatory system the respiratory system
to do moves handles
with processing food
the blood
air exchange