Define the following terms:
$(i)$ Incomplete digestive tract
$(ii)$ Complete digestive tract
$(i)$ Incomplete digestive tract
$(ii)$ Complete digestive tract
(N/A) $(i)$ An incomplete digestive tract is one that has only a single opening to the outside of the body that serves as both mouth and anus.
$(ii)$ $A$ complete digestive tract is one that has two openings,a mouth at the anterior end and an anus at the posterior end.
$(ii)$ $A$ complete digestive tract is one that has two openings,a mouth at the anterior end and an anus at the posterior end.
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