The tube-within-tube body plan provides for
Incomplete digestive system
Complete digestive system
Both (A) and (B)
None of the above
Complete digestive system: The digestive tract is provided with two openings as a mouth that performs ingestion and anus that performs egestion. Such type of body plan is called ‘tube-within-tube’.
Hence,
-
A tube-within-tube body plan shows a complete tubular digestive system with an anterior and posterior opening called mouth and anus respectively.