Question

Which of the following mammalian character has no exception?

• A. External ears
• B. Diaphragm
• C. Enucleated RBC
• D. Corpus callosum

Answer 1

Answer: (B)

Diaphragm, dome-shaped, muscular and membranous structure that separates the thoracic (chest) and abdominal cavities in mammals; it is the principal muscle of respiration.

Presence of diaphragm is the only exceptional character seen in mammals. Other features given are external ears, enucleated RBC, presence of Corpus callosum are features which are rarely seen in others also.