NEET Biology question

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

(A)Internal fertilization
(B)Presence of a completely 4-chambered heart
(C)Homoiothermy
(D)Presence of a muscular diaphragmCorrect

Answer: (D)

Solution

A muscular diaphragm separating the thoracic and abdominal cavities, which aids in breathing, is an exclusive feature of mammals among vertebrates. Internal fertilisation also occurs in reptiles and birds;

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Question ID VK-106882