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B
Annelida and Arthropoda
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C
Cnidaria and Platyhelminthes
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D
None of the above
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Solution
The correct option is B Cnidaria and Platyhelminthes The blind sac body plan is the body plan where the there is a single opening of the digestive system. The tube-like digestive system starts with a single opening through which the food is taken inside and the digested food is expelled through the same opening. The gut is lined with a single layer of endodermal cells that absorb and digest food. Cnidaria and Platyhelminthes exhibit this type of body plan.