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Subject :NSO    Class : Class 7

Study the following table and select the correct option regarding P, Q, R and S.

AOrganism P can also respire through its buccopharyngeal cavity.
BOrganism Q could be a frog or an earthworm.
COrganism R can be Hydrilla or Vallisneria.
DRespiratory structure S is also found in scoliodon and whale.

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