First phylum to have complete digestive tract can be represented by:

Hydra

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Taenia

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Ancylostoma

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Pheretima

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Solution

The correct option is C Ancylostoma
First phylum to have complete digestive tract is phylum Nematoda or Aschelminthes. Nematodes do not have a well developed excretory system but they possess a well developed digestive system from mouth to anus. Ancylostoma belongs to phylum Nematoda.

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…………….. are segmented worms with complete digestive tract.

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