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Which of the following statements is incorrect ?

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The presence of non-vascular sacs, increases the efficiency of respiration in birds

The principle of counter current flow facilitates efficient respiration in gill of fishes

In mammals respiration can occur through skin

Adam's apple is formed by thyroid cartilage surrounding the larynx

answer is C.

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Detailed Solution

In mammals, pulmonary respiration occurs. The cutaneous respiration occurs in amphibians like frog.

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