Frog on land breathe through-
a. Gills
b. Lungs
c. Mouth cavity
d. All of these

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Hint: Respiration is the process of exchanging gases in all life forms between an organism and its environment, which can occur in different ways, either independently or in tandem.

Complete answer:
> Option A is incorrect. The gills of a newly hatched Tadpole are external. When water passes over these gills, they take in oxygen. The gills are absorbed by the body as the tadpole matures, and become an internal part of the anatomy of the tadpole.

> Option B is correct. When they are active, frogs rely on their lungs to breathe and need more oxygen than only the skin respiration can supply. On soil, the lungs serve as the breathing organ. (i.e., respiration to the lungs). In the upper part of the trunk area (thorax), the lungs are a pair of elongated, pink-colored sac-like structures. Since they lack a diaphragm to help control the pressure in their lungs, frogs must collectively use their throats, nostrils, and mouths to breathe in and expel gas.

> Option C is incorrect. Frogs have an extra breathable surface other than their skin-the wet mouth lining. If the mouth of the frog is not fully immersed in water, this respiratory lining is in continuous use, carrying oxygen from the ambient air into the bloodstream and disseminating extra carbon dioxide back into the atmosphere.

> Option D is incorrect. On land, frogs breathe only through the lungs as the air reaches the buccal cavity through the nostrils and then through the lungs. Therefore, until they reach maturity the frog (on land) breathes through the lungs.

Hence, The correct answer is option (B).

Note: Adult frogs breathe via their lungs and disperse gases by skin and mouth covering. Frogs lack functioning lungs at the larval stage of their development but can take in oxygen via a series of gills.