Which one is correct about the respiration of frog? I. In frog, cutaneous and pulmonary respirat...

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Which one is correct about the respiration of frog?
I. In frog, cutaneous and pulmonary respiration are found
II. A pair of elongated pink hollow lungs are found in thorax
III. Atmospheric \( \mathrm{O}_{2} \longrightarrow \) Nostril \( \rightarrow \) Buccal cavity \( \longrightarrow \) Lungs
IV. During aestivation and hibernation, gaseous exchange takes place through skin.
(a) All
(b) I, II, III
(c) III
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