1
Question
Character found only in mammals is
Character found only in mammals is
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Solution
The correct option is D Diaphragm
The diaphragm is the only organ, which only and all mammals have and without which no mammals can live. It is a sheet of internal skeletal muscle that extends across the bottom of the thoracic cavity. The diaphragm separates the thoracic cavity containing the heart and lungs, from the abdominal cavity and performs an important function in respiration. As the diaphragm contracts, the volume of the thoracic cavity increases and air is drawn into the lungs. Hence, option D is correct.
The diaphragm is the only organ, which only and all mammals have and without which no mammals can live. It is a sheet of internal skeletal muscle that extends across the bottom of the thoracic cavity. The diaphragm separates the thoracic cavity containing the heart and lungs, from the abdominal cavity and performs an important function in respiration. As the diaphragm contracts, the volume of the thoracic cavity increases and air is drawn into the lungs. Hence, option D is correct.
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