In which of the following is the digestive sy | vedclass

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(C) The digestive system is considered incomplete when there is only a single opening to the outside of the body that serves as both mouth and anus. I

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Tapeworm

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(C) The digestive system is considered incomplete when there is only a single opening to the outside of the body that serves as both mouth and anus. In $Platyhelminthes$ (flatworms), such as the $Tapeworm$ $(Taenia)$, the digestive system is often incomplete or even absent (as in the case of $Tapeworms$ which absorb nutrients directly through their body surface). $Earthworms$ $(Annelida)$, $Cockroaches$ $(Arthropoda)$, and $Roundworms$ $(Aschelminthes)$ possess a complete digestive system with two separate openings (mouth and anus).

In which of the following is the digestive system incomplete, branched, or absent?

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