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In the insects, respiratory pigment is absent in the blood as oxygen is supplied by a tracheal system.

Fish gills exhibit 'countercurrent oxygen exchange' to maximize the amount of oxygen that their blood can pick up.

In frogs, skin is richly supplied with the blood vessels and hence they can carry out only cutaneous respiration.

In the birds, double ventilation is observed where, non-respiratory air sacs aid in the respiration.

answer is D.

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Detailed Solution

In frogs, skin is richly supplied with the blood vessels and hence they can carry out cutaneous respiration. But, it is not the only mode of respiration.

Frogs exhibit various modes of respiration ; branchial (gills-in tadpole stage), pulmonary(lungs), buccal(buccal cavity) and cutaneous(skin).

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