Which of the following class is incorrectly matched with its general characters? (a) Cyclostomat...

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Which of the following class is incorrectly matched with its general characters?
(a) Cyclostomata : Lack jaws and paired fins and body is covered with placoid scales.
(b) Osteichthyes : Four pairs of gills are covered with an operculum and skin is covered with cycloid scales.
(c) Reptilia : Tympanum represents ear and fertilisation is internal.
(d) Aves : Endoskeleton is fully ossified and Iong bones are hollow with air cavities called as pneumatic bones.
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