A) Presence of a four chambered heart
B) Homeothermic condition
C) Respiration by lungs
D) Presence of a diaphragm
Correct Answer: D
Solution :
Presence of diaphram is characteristic feature of mammals. The human lungs are made up of some \[7.5\times {{10}^{8}}\]alveoli. Thus each lung consists of its bronchial tree with its many air sacs and alveoli units together with other associated structure such as blood vessels, nerves and pleura. Extemaly they are covered by viceral pleura, which is also surrounded by parietal pleura forming the inner lining of the wall of chest the diaphragm, a domeshaped partition forms the floor of the chest cavity and seprate it from the abdomen. Heart is four chambered in birds, mammals and some reptiles (crocodial, alligator).
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