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Name: Crystal
Status: Student
Age: 15
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Question:
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?


Replies:
When something reaches the end and there's something else behind it, what happens in the two alternative cases?

Richard E. Barrans Jr., Ph.D.
Assistant Director
PG Research Foundation, Darien, Illinois


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