(C) The blind sac body plan is exhibited by some eumetazoans,such as cnidarians (e.g.,$Hydra$) and flatworms (e.g.,$Fasciola$).In these organisms,the

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(C) The blind sac body plan is exhibited by some eumetazoans,such as cnidarians (e.g.,$Hydra$) and flatworms (e.g.,$Fasciola$).In these organisms,the body has a single opening that serves as both the mouth and the anus,meaning they lack a complete digestive tract.