Which of the following is true for all mammals without any exception?

Presence of diaphragm

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Presence of pinna

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Presence of

7

cervical vertebrae

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Testis in extra abdominal scrotal sac

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Solution

The correct option is A Presence of diaphragm
The diaphragm, located below the lungs, is the major muscle of respiration. It is a large, dome-shaped muscle that contracts rhythmically and continually, and most of the time, involuntarily. The diaphragm is the only organ, which only and all mammals have and without which no mammal can survive.
So, option A is the correct option.

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