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(B) The phylum $Aschelminthes$ (also known as $Nematoda$) is the first group of animals to exhibit a complete digestive system,which includes a well-d

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Aschelminthes

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(B) The phylum $Aschelminthes$ (also known as $Nematoda$) is the first group of animals to exhibit a complete digestive system,which includes a well-developed muscular pharynx and distinct mouth and anus openings. In contrast,$Platyhelminthes$ possess an incomplete digestive system (a single opening serving as both mouth and anus). $Annelida$ and $Arthropoda$ also possess complete digestive systems,but they evolved after $Aschelminthes$.

The first animal group to possess a complete digestive system is .........

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