Which of the following is an exclusive character of class Mammalia?

Homeothermy

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Internal fertilization

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Presence of muscular diaphragm

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Completely four chambered heart

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Solution

The correct option is D Presence of muscular diaphragm
Birds are also homeotherms like mammals. Four-chambered heart is also present in birds and in some reptile. Internal fertilization is common in many animals. But the muscular diaphragm between the thoracic cavity and abdomen is the unique character of mammals.

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