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Q:

The body of the ______ is circular in cross-section, hence, the name roundworms. They may be free-living, aquatic and terrestrial or parasitic in plants and animals.

  • 1
    Platyhelminthes
  • 2
    Ctenophores
  • 3
    Mollusca
  • 4
    Aschelminthes
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Answer : 4. "Aschelminthes"
Explanation :

The body of the aschelminthes is circular in cross-section, hence, the name roundworms. They may be free living, aquatic and terrestrial or parasitic in plants and animals. Roundworms have organ-system level of body organisation. They are bilaterally symmetrical, triploblastic and pseudocoelomate animals.

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