Among mammals, the efficiency of ventilation of lungs as compared to reptiles and birds is better developed by the presence of

In mammals ventilation movements of lungs are governed by

The ventilation movements of the lungs in mammals are governed by

The ventilation movements of the lungs in mammals are governed by

The ventilation movements of the lungs in mammals are governed by

Birds are differ from mammals in presence of :-

Lung diseases are about four times more probable in urban areas as compared to rural areas . This is due to the presence of which of the following in atmosphere ?

Lung diseases are about four times more probable in urban areas as compared to rural areas . This is due to the presence of which of the following in atmosphere ?

The evidence for the origin of birds from reptiles is the presence in them of :