1.

Which of the following is an exclusive character of Class Mammalia ?A. Internal fertilisationB. Presence of a completely 4-chambered heartC. HomoiothermyD. Presence of a muscular diaphram

Answer» Correct Answer - D
Presence of a muscular diaphragm is an exclusive character of class Mammalia. Diaphragm is a complete muscular partition that separates the thoracic cavity from the adbominal cavity. It increases the efficiency of breathing.


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