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Trace the digestive tract. This is best done with one of the largefemale worms and ...

Trace the digestive tract. This is best done with one of the largefemale worms and will require adjusting the iris diaphragm to achievegreater contrast. Vinegar eels are sometimes said to have a tube-within-a-tube body plan. Is this a good description, if so, why?
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Answer #1

yes,it is good description because tube within a tube means a development of fluid filled cavity present between outer body wall and the digestive tube

and in vinegar eels,the body wall forms the outer tube and digestive tract forms the inner tube.

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