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Name: Crystal
Status: Student
Age: 15
Location: N/A
Country: N/A
Date: N/A 

Imagine an assembly line for assembling things instead of putting them together. Compare the earthworm's tubelike digestive system to such a "disassembly line." What is the advantage of a tubelike digestive system over a saclike digestive system?

There are several. One is that you will not mix your waste with your undigested food. Second, you can concentrate on specific digestion without interfering with other digestive processes. These two reasons alone are very significant justification for the one way tube.

Steve Sample

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