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Why are annelids refered as tube within a tube?

April 26, 2017annelids refered tube

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Why are annelids refered as tube within a tube?

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Well inside the worm has a gut that is just as long and as straight as it is on the outside. And between the outer-skin and the inner gut there is the body medium, a mostly fluid filled series of chambers. This makes for a tube within a tube.