Which of the following statements is incorrec | vedclass

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(C) The correct answer is $C$. $1$. Rats are mammals,and they possess a diaphragm that separates the thoracic cavity from the abdominal cavity. This i

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In Catla,the operculum is absent.

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(C) The correct answer is $C$. $1$. Rats are mammals,and they possess a diaphragm that separates the thoracic cavity from the abdominal cavity. This is a correct statement. $2$. Chameleons are reptiles,and their body is covered by dry and cornified skin with epidermal scales or scutes. This is a correct statement. $3$. Catla is a bony fish $(Osteichthyes)$. Bony fishes possess four pairs of gills which are covered by an operculum on each side. Therefore,the statement that the operculum is absent in Catla is incorrect. $4$. Crows are birds $(Aves)$. Birds have lungs that are supplemented by air sacs to facilitate respiration and reduce body weight for flight. This is a correct statement.

Which of the following statements is incorrect?

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