The blind sac body plan is applicable to (a)Porifera(b)Annelida and Arthropoda(c)Cnidaria and Platyhelminthes(d)None of the above
The blind sac body plan is applicable to the following option: (c) Cnidaria and Platyhelminthes.
In the blind sac body plan, there is a single opening that serves as both the mouth and the anus. This is in contrast to the "tube-within-a-tube" body plan, where there are separate openings for the mouth and anus, with a digestive tract that runs from the mouth to the anus. Cnidarians (such as jellyfish and corals) and Platyhelminthes (flatworms) exhibit the blind sac body plan, as they have a single opening for both ingestion of food and expulsion of waste.
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