(C) The $Blind \text{ } sac$ body plan is characteristic of organisms that possess a single opening to the digestive tract, which serves as both the m

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(C) The $Blind \text{ } sac$ body plan is characteristic of organisms that possess a single opening to the digestive tract, which serves as both the mouth for ingestion and the anus for egestion. This type of body plan is found in $Coelenterates$ (Cnidarians) and $Platyhelminthes$ (flatworms).