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12-11-2017
Biology

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The first invertebrates to show both segmentation and a complete digestive system belong to the

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22-11-2017

The first invertebrates to show both segmentation and a complete digestive system belong to the phylum Annelida that includes earthworms, leech, sandworms, etc.

These segmented worms have complete digestive system which is also known as tube-within a tube. These can be found in freshwater, marine water or can even be terrestrial.

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