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(B) complete digestive tract consists of two openings: a mouth and an anus. In the animal kingdom,the phylum $Aschelminthes$ (also known as $Nematoda$

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Aschelminthes

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(B) complete digestive tract consists of two openings: a mouth and an anus. In the animal kingdom,the phylum $Aschelminthes$ (also known as $Nematoda$) is the first group to exhibit a complete alimentary canal with a well-developed muscular pharynx. $Platyhelminthes$ possess an incomplete digestive system (a single opening serving as both mouth and anus),while $Annelida$ and $Arthropoda$ also possess complete digestive tracts,but they appear later in the evolutionary sequence.

The first complete digestive tract is found in the phylum .........

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