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.