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B
Cnidarians
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C
Nematodes (Aschelminthes)
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D
Annelids
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Solution
The correct option is D
Annelids
Organ system level of organisation is observed in Phylum Aschelminthes (Nematoda), and all the groups above it in the Animal Kingdom. Sponges exhibit cellular level or organisation, while cnidarians exhibit tissue level of organisation.