The normal range of 'breathing rate' per minute of an average adult person at rest is 

Which of the following is not part of the human respiratory system? 

The animal which can breathe through the lungs as well as through skin is 

Which of the following does not have lungs for breathing? 

One of the following is not  produced during the anaerobic respiration in yeast.  This is one is 

During heavy exercise, we get cramps in the legs due to the accumulation of 

In cockroaches, air enters the body through

Which of the following is not likely to have a much higher breathing rate? 

During exhalation, the rib cage

One of the following does not have gills for breathing. This one is